At issue in this case is whether a Juvenile Court judge erred in dismissing a youthful offender indictment under G. L. c. 119, § 54, charging the fifteen year old juvenile with *220rape of a child, G. L. c. 265, § 23.1 Prior to jury empanelment, the juvenile moved to dismiss the youthful offender indictment arguing that the charge of rape of a child does not involve the threat or infliction of serious bodily harm as required by G. L. c. 119, § 54.2 After a hearing, the judge allowed the motion to dismiss, concluding that the facts of the case did not involve the threat or infliction of serious bodily harm. We granted the juvenile’s application for direct appellate review. We conclude for the reasons set forth below that the indictment should not' have been dismissed.
The judge made the following findings of fact.3 On December 14, 1996, the victim’s mother told Detective Richard Grafton that, earlier that day, she had left her six year old daughter (victim) and two other children in the care of her fifteen year old brother, the juvenile, while she went to work. She returned home for lunch, and, as she was preparing to leave, her son burst into tears and said, “[the juvenile] stuck his dinky in [the six year old victim’s] mouth.” Her daughters both confirmed what her son had told her. Detective Grafton interviewed the victim. The victim stated that the juvenile came into the room, *221opened his pants, exposed his penis, and placed it in her mouth, that “he made me suck his dinky,” and that she had to stroke his penis with her hands while she was doing this. On February 5, 1997, the victim and her sister were separately interviewed and videotaped by members of the sexual assault unit and essentially reiterated what they had stated earlier to the detective. Additionally, the victim’s sister said that, although “[the juvenile] put his penis in [the victim’s] mouth,” she did not hear the juvenile say anything. The victim stated: “My uncle made me suck his dinky ... he didn’t do nothing else . . . [and] [h]e didn’t say anything.” She further stated that the juvenile did not do anything to make her do it, “he just did it.” She said that he put her hands “on his dinky,” but “didn’t do nothing to my hands [when they were on his penis].” The victim said that the juvenile did not say anything to her afterward, and specifically did not say anything about not telling her mother or anyone else.
The judge denied the juvenile’s motion to dismiss the indictment on jurisdictional grounds, concluding that the juvenile need not be a youthful offender to be indicted pursuant to G. L. c. 119, § 54, but rather that a juvenile so indicted may subsequently be adjudicated as a youthful offender. The judge concluded that, to determine whether the juvenile may be transferred under § 54, a judge must look to the specific factual allegations in the case if the elements of the offense do not necessarily include the infliction or threat of serious bodily harm. The judge reviewed the grand jury minutes, the videotaped interviews, and the transcripts of those interviews. He then applied a probable cause standard and concluded that the Commonwealth had not met its burden of proving that the juvenile committed an offense which involves the infliction or threat of serious bodily harm. The judge did not need to address the juvenile’s constitutional arguments.
On appeal, the Commonwealth argues that the judge erred in dismissing the indictment because rape of a child, G. L. c. 265, § 23, is an offense which inherently involves the threat or infliction of serious bodily harm as required for a youthful offender indictment under G. L. c. 119, § 54. The juvenile argues that, because statutory rape is an offense which intrinsically does not involve the threat or infliction of serious bodily harm, the grand jury lacked jurisdiction under G. L. c. 119, § 54, to indict him as a youthful offender and points out that the Commonwealth *222need not prove lack of consent, force, or threat of bodily injury.4 See Commonwealth v. Thayer, 418 Mass. 130, 132 (1994). The juvenile further argues that it is the specific facts of the felony charged that dictate whether a youthful offender indictment may be brought, therefore, the judge was correct in ruling that the facts of this case do not involve the threat or infliction of serious bodily harm. Last, the juvenile contends that, if § 54 is interpreted to include statutory rape as a “transferable” offense, the statute would be unconstitutionally vague on its face and as applied because the statute provides no notice that an offense not involving as an element the threat or infliction of serious bodily harm could be brought under § 54.
1. The youthful offender act. A comparison of the former transfer statute with the current youthful offender act is helpful in resolving the issues raised by this appeal. The former transfer statute, G. L. c. 119, § 61, authorized transfer by judicial waiver. The Juvenile Court judge was charged with making the preliminary determination whether a particular offense met the jurisdictional requirement. G. L. c. 119, § 61. In the probable cause portion of the transfer hearing, commonly known as a “Part A hearing,” the judge then had to find that there was probable cause to “believe that the child ha[d] committed the offense or violation charged.” Commonwealth v. DiBenedetto, 414 Mass. 37, 47 (1992), quoting G. L. c. 119, § 61. If the judge determined that probable cause existed, “dangerousness and amenability to rehabilitation are considered at a proceeding styled a Part B hearing.” Commonwealth v. Wayne W., 414 Mass. 218, 219-220 n.2 (1993). Under the former statute, “[w]e . . . adopted a directed verdict standard to determine whether the evidence was sufficient to support a transfer.” Commonwealth v. DiBenedetto, supra at 48, citing Commonwealth v. Matthews, 406 Mass. 380, 388 (1990).
The Legislature enacted the youthful offender act, St. 1996, c. 200 (act), and repealed G. L. c. 119, § 61. In response to societal concerns about violent crimes committed by juveniles, the act drastically altered the procedure to be applied in such *223cases. See generally R.L. Ireland, Juvenile Law §§ 1-3, at 2-19 (1993 & Supp. 1998).
The act provides for prosecutorial discretion to proceed by an indictment where the juvenile has attained a certain age and is alleged to have committed a certain class of felonies.5 Youthful offenders are those who, while between the ages of fourteen and seventeen years, commit acts that would be punishable by commitment to State prison if committed by adults and have previously been committed to the Department of Youth Services, or have committed offenses which “involve[] the infliction or threat of serious bodily harm,”6 or commit firearms offenses. See G. L. c. 119, § 54, as amended through St. 1996, c. 200, § 2. See note 2, supra. Once a juvenile is treated as a youthful offender, he is no longer given the protections and privileges afforded to delinquent children. See Doe v. Attorney Gen. (No. 1), 425 Mass. 210, 212-213 n.8 (1997).
In the present case, the judge conducted a hearing on the juvenile’s motion to dismiss which was the equivalent of a transfer hearing under the former transfer statute. The current statute makes no provision for review of a prosecutor’s decision to try the juvenile as an adult. “ ‘[W]e must read the statute in a way to give it a sensible meaning.’ Beeler v. Downey, [387 Mass. 609, 616 (1982)], citing Lexington v. Bedford, 378 Mass. 562, 570 (1979).” Commonwealth v. Dodge, 428 Mass. 860, 865 (1999). The Legislature clearly intended to authorize the transfer of youthful offenders on an indictment sought by the prosecuting attorney without the transfer hearing required under the former procedure. See G. L. c. 119, § 54 (“Commonwealth may proceed ... by indictment” [emphasis added]). It compels the judge to proceed on the indictment in accordance with other statutory requirements set out in §§ 55-72, inclusive. See id. *224(“court shall proceed on the complaint or the indictment” [emphasis added]).
The Legislature’s decision to provide the prosecutor with the discretion to seek a youthful offender indictment, as long as the statutory prerequisites are met, is merely a limitation on the special treatment of juveniles consistent with the prosecutor’s traditional broad discretion in deciding whether to prosecute a case.7 “The Legislature has great latitude in defining criminal conduct and in prescribing penalties to vindicate the legitimate interests of society.” Commonwealth v. Pyles, 423 Mass. 717, 720 (1996), and cases cited. “The function of the legislature [in this area] is primary, its exercises fortified by presumptions of right and legality, and is not to be interfered with lightly, nor by any judicial conception of their wisdom or propriety.” Id. at 721, quoting Weems v. United States, 217 U.S. 349, 379 (1910). We have also recognized that the Legislature may establish and define methods of criminal practice and procedure. Commonwealth v. Pyles, supra at 722. Therefore, we conclude that, absent an error of law, a judge may not dismiss an indictment brought under G. L. c. 119, § 54.
We now turn to the question whether the act authorized the prosecutor to seek an indictment for the offense of rape of a child. The juvenile contends that the grand jury lacked jurisdic-*225tian to indict him under G. L. c. 119, § 54, because neither the facts of the case nor the underlying felony involve the infliction or threat of serious bodily harm.
The act does not define the phrase “infliction or threat of serious bodily harm.” See G. L. c. 119, § 54; G. L. c. 119, § 61. Neither does the act specifically provide, as the juvenile contends, that the subject offense must contain as an element of the crime the infliction or threat of serious bodily harm. “It is a well-established proposition that criminal statutes are to be construed narrowly. We have stated that ‘[w]e must resolve in favor of criminal defendants any reasonable doubt as to [a] statute’s meaning.’ ” Commonwealth v. Kerr, 409 Mass. 284, 286 (1991), quoting Commonwealth v. Connolly, 394 Mass. 169, 174 (1985). “[Ajlthough penal statutes must be strictly construed, that maxim ‘does not require “that language be strained to reach a result favorable to the defendant.” ’ ” Commonwealth v. Caracciola, 409 Mass. 648, 654 (1991), quoting Commonwealth v. McMenimon, 295 Mass. 467, 470 (1936). “When a statute does not define its words we give them their usual and accepted meanings, as long as these meanings are consistent with the statutory purpose. . . . We derive the words’ usual and accepted meaning from sources presumably known to the statute’s enactors, such as their use in other legal contexts and dictionary definitions.” Commonwealth v. Campbell, 415 Mass. 697, 700 (1993), quoting Commonwealth v. Zone Book, Inc., 372 Mass. 366, 369 (1977).
We reject the juvenile’s argument that statutory rape is not a transferable offense under G. L. c. 119, § 54, because the elements of the crime do not require the Commonwealth to prove lack of consent, force, or threat of bodily injury. See Commonwealth v. Thayer, 418 Mass. 130, 132 (1994). We read the act as granting prosecutorial discretion to seek an indictment of a juvenile as a youthful offender in cases where the conduct constituting the offense itself involves the infliction or threat of serious bodily harm. There is no suggestion in the act that the Legislature intended to limit its scope to felonies in which the infliction or threat of serious bodily harm is an element of the crime.8 Under § 61, the Legislature explicitly provided that certain violent crimes automatically triggered a transfer hearing. *226The current statute makes no distinction among violent crimes. It does, however, include within the prosecutor’s discretion certain nonviolent crimes, such as possession or distribution of a firearm in response, we believe, to the increase in firearm offenses committed by juveniles. It is illogical to suggest that, in enacting the youthful offender act, the Legislature intended to limit rather than broaden the class of violent offenses for which a juvenile may be indicted as a youthful offender.9 As one of the necessary elements of rape of a child, the Commonwealth must prove that the defendant penetrated the child. In the circumstances here the invasive nature of the act of penetration created the threat of serious bodily harm.
The juvenile’s position of authority, the age difference between the juvenile and the victim, and the vulnerability of the victim are sufficient to support a youthful offender indictment. The judge should not have dismissed the indictment.
2. Vagueness. As an initial matter, the Commonwealth contends that we should refrain from considering the constitutional issues raised by the juvenile which were not reached below. See Doe v. Attorney Gen. (No. 1), 425 Mass. 210, 211-212, 216 (1997).
We ordinarily do not decide matters not strictly before us. On occasion we have expressed our views on such matters where the case has been fully briefed, where there is a public interest in obtaining a prompt answer to the question, and when the answer to be given is reasonably clear. See Brown v. Guerrier, 390 Mass. 631, 632-633 (1983). “There may always be *227exceptional cases or particular circumstances which will prompt a reviewing or appellate court, where injustice might otherwise result, to consider questions of law which were neither pressed nor passed upon by the court or administrative agency below. . . .” Gurry v. Board of Pub. Accountancy, 394 Mass. 118, 126 (1985), quoting Albert v. Municipal Court of Boston, 388 Mass. 491, 494 (1983). In this case the Commonwealth has not briefed the constitutional issues which also were not extensively argued or decided below. We nevertheless make some observations which may aid the parties in any further litigation.
The juvenile argues that, if § 54 is construed to include statutory rape as a prerequisite offense for a youthful offender indictment, it is unconstitutionally vague both on its face and as applied because it provides no notice that an offense, not involving, as an element of the crime, the threat or infliction of serious bodily harm, is included within the purview of the act.10 We assume for the purposes of discussion that the “void for vagueness” test applies in these circumstances.
“The void for vagueness doctrine requires that criminal statutes be defined in terms that are sufficiently clear to permit a person of average intelligence to comprehend what conduct is prohibited. Commonwealth v. Taylor, [413 Mass. 243, 248 (1992)], quoting Commonwealth v. Gallant, 373 Mass. 577, 580 (1977). Due process requires not only fair notice of proscribed conduct, but also that penal statutes be administered in a manner that prevents arbitrary and discriminatory enforcement.” Commonwealth v. Spano, 414 Mass. 178, 180 (1993), and cases cited. “[I]f the language which is challenged conveys sufficiently definite warning as to the proscribed conduct when measured by common understanding and practices, it is constitutionally adequate.” Commonwealth v. Jarrett, 359 Mass. 491, 496-497 (1971), and cases cited. Moreover, the use of general terms in a statute will not make it constitutionally inadequate. Opinions of the Justices, 378 Mass. 822, 827 (1979).
The purpose behind the youthful offender act was to reduce or to eliminate certain protections previously available to all *228juvenile offenders in an effort to address growing concern about violent crimes committed by juveniles. See Doe v. Attorney Gen. (No. 1), supra at 212-213 & n.8. Here the juvenile stands accused of conduct which, if proved, would be included under the commonly understood meaning of “the infliction or threat of serious bodily harm” so as to give the juvenile a fair warning that his conduct is proscribed and may subject him to adult penalties.
The juvenile also argued in his motion to dismiss that the act was void for vagueness because it does not establish explicit standards so as to protect against arbitrary and discriminatory law enforcement. As noted above, a prosecutor has wide discretion in determining whether to prosecute an individual. Commonwealth v. Latimore, 423 Mass. 129, 136 (1996). “ ‘This broad discretion rests largely on the recognition that the decision to prosecute is particularly ill-suited to judicial review.’ Wayte v. United States, 470 U.S. 598, 607 (1985) .... The decision to prosecute may not be deliberately based ‘on an impermissible classification such as race, religion, or sex,’ Commonwealth v. Franklin Fruit Co., 388 Mass. 228, 230 (1983); Commonwealth v. Franklin, 376 Mass. 885, 894 (1978), or because of the defendant’s exercise of constitutional, statutory, or procedural rights. Commonwealth v. Johnson, 406 Mass. 533, 536-537 (1990); Commonwealth v. McGovern, 397 Mass. 863, 865-867 (1986). Accord Wayte [v. United States,] supra', United States v. Bourgeois, 964 F.2d 935, 938 (9th Cir.), cert. denied, 506 U.S. 901 (1992); United States v. Penagaricano-Soler, 911 F.2d 833, 837 (1st Cir. 1990).” Commonwealth v. Latimore, supra.11
The order dismissing the indictment is vacated and the case is remanded to the Boston Juvenile Court for further proceedings.
So ordered.
The indictment was transferred to the juvenile division of the West Roxbury District Court, where the juvenile was arraigned on March 21, 1997. The case was then transferred on October 10, 1997, to'the Boston Juvenile Court for trial.
General Laws c. 119, § 54, as amended through St. 1996, c. 200, § 2, provides in relevant part:
“The Commonwealth may proceed by complaint in juvenile court or in a session of a district court, as the case may be, or by indictment as provided by chapter two hundred and seventy-seven, if a person is alleged to have committed an offense against a law of the commonwealth while between the ages of fourteen and seventeen which, if he were an adult, would be punishable by imprisonment in the state prison, and the person has previously been committed to the department of youth services, or the offense involves the infliction or threat of serious bodily harm in violation of law or the person has committed a violation of paragraph (a), (c) or (d) of section ten or section ten E of chapter two hundred and sixty-nine. The court shall proceed on the complaint or the indictment, as the case may be, in accordance with sections fifty-five to seventy-two, inclusive. Complaints and indictments brought against persons for such offenses, and for other criminal offenses properly joined under Massachusetts Rules of Criminal Procedure 9 (a) (1), shall be brought in accordance with the usual course and manner of criminal proceedings.” (Emphasis added.)
In finding these facts, the judge stated that he was accepting the grand jury minutes not to prove the truth of the facts, but rather to prove the specific nature of the allegations supporting the indictment.
We agree with the single justice’s conclusion in Commonwealth vs. John Golden, S.J.C. No. SJ-97-0405 (Nov. 6, 1997), regarding the term “youthful offender.” “[A] defendant need not be a youthful offender to be indicted pursuant to G. L. c. 119, § 54, but rather that a person so indicted may subsequently be adjudicated as a youthful offender. . . . ‘Youthful offender’ refers not to a status necessary before an indictment may be brought by a prosecutor, but to a status that is an outcome of indictment and adjudication.”
Every State has a transfer statute authorizing the transfer of youthful offenders to adult court and utilizes one or a combination of three transfer mechanisms: prosecutorial discretion, statutory exclusion, and judicial waiver of Juvenile Court jurisdiction. Note, Listen to the Children: The Decision to Transfer Juveniles to Adult Court, 30 Harv. C.R.-C.L. L. Rev. 507, 520 (1995). Other States that have enacted similar statutes refer to our procedure of transfer as “direct files” or prosecutorial waiver. Id. at 521.
The juvenile was fifteen years old at the time and the offense of statutory rape is punishable by imprisonment in the State prison. Because the juvenile has not previously been committed to the Department of Youth Services, we must consider whether the offense of rape of a child, G. L. c. 265, § 23, is one which “involves the infliction or threat of serious bodily harm.”
See Commonwealth v. Pyles, 423 Mass. 717, 720 (1996). “[A] judge may not dismiss a legally valid indictment over objection by the Commonwealth.” Commonwealth v. Thurston, 419 Mass. 101, 104 (1994), citing Commonwealth v. Pellegrini, 414 Mass. 402, 404-407 (1993). See Commonwealth v. Brandano, 359 Mass. 332, 334-335 (1971). See also Commonwealth v. Doe, 412 Mass. 815, 818 (1992) (“[ajbsent some legal basis for doing so, a judge may not reduce the charges against a defendant over the Commonwealth’s objection”); Commonwealth v. Gordon, 410 Mass. 498, 503 (1991) (pretrial dismissal of lawful complaint prematurely cuts off prosecution without legal basis). Of course, we have also recognized that a judge may properly dismiss an indictment over the objection of the prosecutor in certain circumstances. See Commonwealth v. O’Dell, 392 Mass. 445, 447 (1984) (improper presentation of evidence to grand jury requires dismissal of indictment without prejudice); Commonwealth v. Salman, 387 Mass. 160, 166 (1982) (false testimony before grand jury to procure indictment is ground for its dismissal); Commonwealth v. McCarthy, 385 Mass. 160, 163 (1982) (insufficient evidence presented to grand jury to justify arrest of defendant). Moreover, “pretrial dismissal cannot be sustained if, as here, the Commonwealth fails or refuses to stipulate that it has presented all the proof available for a contemplated trial.” Commonwealth v. Pellegrini, supra at 406, citing Commonwealth v. Freiberg, 405 Mass. 282, 300-301, cert. denied, 493 U.S. 940 (1989).
In Commonwealth v. A Juvenile, 10 Mass. App. Ct. 385, 391 (1980), an analogous case arising out of G. L. c. 119, § 61, the repealed transfer statute, the Appeals Court held that the offense of “operating a motor vehicle *226negligently ‘so that the lives or safety of the public might be endangered’ ” was an offense which involved the infliction or threat of serious bodily harm. Id. at 390-392. The court, however, did not consider the underlying facts of the offense, but focused on whether the offense itself involved a threat of.serious bodily harm. Id. at 389-391. In doing so, the court concluded that the word “threat” included both intentional and unintentional threats and held that “the natural reading of § 61 is that it authorizes transfers where an offense involves a danger (threat) of serious bodily harm.” Id. at 390. That case may be distinguished from the instant case. There, the juvenile did not argue that the facts of the offense did not include the threat or infliction of serious bodily harm, but rather argued that the offense itself did not satisfy the statutory basis for a transfer hearing. Id. at 389-391.
We find no merit in the juvenile’s argument that the fact that the prosecutor did not seek an indictment under G. L. c. 265, § 22A, for forcible rape of a child illustrates that there was no infliction or threat of serious bodily harm. It is clearly the Commonwealth’s discretion to choose between two statutes. See Commonwealth v. Hudson, 404 Mass. 282, 288-289 (1989). ■
Specifically the juvenile argues that an ordinary adolescent would not be on notice that neither the specific allegations of the incident nor the crime of statutory rape involves allegations of force, violence, or threats. Further, he asserts that there has been no allegation that the victim has suffered any physical harm as a result of the juvenile’s actions.
“There is ‘no [Federal] constitutional right to any preferred treatment as a juvenile offender.’ ” Commonwealth v. Wayne W., 414 Mass. 218, 222 (1993), quoting Stokes v. Fair, 581 F.2d 287, 289 (1st Cir. 1978), cert. denied, 439 U.S. 1078 (1979). We have also recognized that the Legislature, if it chose to do so, could have lawfully abolished Juvenile Court jurisdiction. Commonwealth v. Wayne W., supra at 223.