¶1Early one evening in February, 1992, the defendant and a companion, Westgate, were out walking in New Bedford “seeing what [they] could get into.” They saw a sixty-five year old woman, Lucille Labens, bringing out her household trash and decided to steal her purse, which hung by a strap from her left arm. Westgate walked up behind Mrs. Labens, grabbed the purse strap, and attempted to slide it off her *215arm.
¶2The defendant does not appeal from his conviction of unarmed robbery. As to the involuntary manslaughter conviction, the defendant makes two arguments: (1) that the Commonwealth’s proof was insufficient as to one element of the crime, namely that the purse snatching “was undertaken with knowledge of facts that would cause a reasonable person to know that a danger of serious harm existed,” Commonwealth v. Sires, 413 Mass. 292, 302 (1992); and (2) that the manslaughter indictment was submitted to the jury on two theories of liability, one of which was inapplicable to the evidence, so that, because it is impossible to know on which theory the jury acted in reaching its general verdict, the conviction cannot stand. See Commonwealth v. Plunkett, 422 Mass. 634, 635 (1996), and cases cited.
¶31. We reject the first argument, which is predicated on a statement in Commonwealth v. Moran, 387 Mass. 644, 651 (1982), that “[u]narmed robbery is not inherently dangerous to human life. Purse snatching can be robbery, see Commonwealth v. Jones, 362 Mass. 83, 89 (1972), but it need not be dangerous to life.” The Morancase concerned felony-murder. The point being made was that a robbery, if the perpetrator is unarmed, does not by its nature pose a substantial risk to life; so that, in order to sustain a charge of felony-murder, the Commonwealth would have to prove that special circumstances of which the perpetrator knew or should have known did in fact pose a serious risk to life that the perpetrator chose to disregard. Ibid.This case involves not felony-murder, but involuntary manslaughter, *216which only requires “a high degree of likelihood that substantial harm will result to another.” Commonwealth v. Catalina, 407 Mass. 779, 789 (1990), quoting from Commonwealth v. Welansky, 316 Mass. 383, 399 (1944). Commonwealth v. Sires, 413 Mass, at 304 n.14. That test was met. Any robbery from the person, with the possible exception of pickpocketing, involves a substantial likelihood that the victim will resist and that a struggle may ensue. Where the victim is elderly, years removed from the rough and tumble of the playground and contact sports, and with the impaired resilience of bone and sureness of balance that age entails, any resistance will lead predictably to falls and a high likelihood of injury.
¶42. Picking up on a suggestion made in the Commonwealth’s *217brief, the defendant in his reply brief makes an argument not raised earlier either in this court or below: namely, that the judge, who instructed the jury on both the wanton and reckless aspect of involuntary manslaughter and on the battery-causing-death aspect of that crime, see Commonwealth v. Catalina, 407 Mass, at 789, erred because the battery-causing-death aspect of involuntary manslaughter is inapplicable where the battery occurs, as it did here, in the commission of a felony (i.e., unarmed robbery).
¶5The defendant’s argument is predicated on decisions since Catalinathat both parties read as having held that the non-felonious character of the defendant’s underlying crime is, in effect, an element of battery-manslaughter.
¶6Under the law prior to Commonwealth v. Matchett, 386 Mass. 492 (1982), and Commonwealth v. Catalina, supra,the general rule was that an unintended death caused by the commission of a crime malum in se was murder if the crime was a felony and manslaughter if the crime was a misdemeanor only.
¶7If, as appears to be true, the perceptible degree of danger posed by the defendant’s conduct marks the dividing line between murder liability and manslaughter liability for unintended deaths occurring in the commission of another underlying crime, the earlier felony-misdemeanor dividing line no longer serves a purpose if it refers to the legal status of the underlying crime. Indeed, its retention would create a legal no man’s land in a case such as this where the underlying crime — unarmed robbery — is a felony but the defendant’s conduct poses a foreseeable risk of physical injury only, not death; and a factor — the felonious nature of the defendant’s conviction — that operated under the earlier law as one of aggravation would become one of exoneration from any legal responsibility for the death.
¶8The cases since the Matchettand Catalinadecisions that have referred to felonious and non-felonious batteries
¶9If this reading of the post-Catalina decision is incorrect, and it was error to charge the jury on battery-manslaughter, nevertheless any error was harmless. Under Commonwealth v. Catalina, involuntary manslaughter has two aspects: a battery aspect, and a wanton, reckless behavior aspect. The battery aspect requires the Commonwealth to prove that the battery was done “with such violence that [physical] harm is likely to result [to the victim].” Commonwealth v. Sheppard, 404 Mass, at 777, discussed in Catalina, supraat 784 nn. 5 & 6. That degree of culpability was differentiated, at least verbally, from the degree of culpability required for the wanton and reckless aspect of involuntary manslaughter, see id.at 784 n.5, which was stated, in the words of Commonwealth v. Welansky, 316 Mass, at 399, as “a high degree of likelihood that substantial harm will result to another.” See Catalina, supra at 789. Any differentiation disappeared with the subsequent decision in Commonwealth v. Sneed, 413 Mass, at 394, which amended the formulation of Catalinaand Sheppard, see Sneed, supraat 394 n.5, such that, henceforth, the Welanskytest of culpability would apply as well under the battery aspect of involuntary manslaughter. “Thus the same standard of proof is applicable to both types of involuntary manslaughter . . . .” Sneed, supra at 394. See note 3, supra. In a charge more favorable to the defendant than was required, the judge in this case instructed the jury that a battery, for purposes of involuntary manslaughter, “occurs when the [perpetrator] is aware or should be aware that the battery he is committing endangers human life.” Thus, even if the jury conceived of its verdict as battery-manslaughter, it necessarily found the elements of wanton, reckless manslaughter.
¶10Judgments affirmed.
¶11The defendant suggested the snatch, and Westgate agreed to do the act when the defendant promised to do the next one.
¶12The defendant and Westgate then fled, went to the defendant’s residence, divided up the cash, and threw the purse into a dumpster.
¶13There was ample evidence from which the jury could properly infer that, before Westgate actually knocked the victim down, the joint venturers must have been aware that the victim was an elderly person. First, the incident began when they observed Mrs. Labens from across the street and discussed which one would grab the purse. Second, although Westgate approached her from behind, it is a matter of common experience that one can get a sense of a person’s age even from such a vantage point — particularly here, where Westgate walked rather than ran up behind her, giving him ample time to observe her,, and where he came up directly adjacent to her, within arm’s reach. Third, the jury could infer that, in his initial struggle with her and before he knocked her down, Westgate observed the victim and knew she was an older person, yet chose to disregard that fact in his pursuit of her property. (There was testimony from a good Samaritan who happened by after the incident that the victim was elderly in appearance. A photograph of the victim was also put in evidence.)
¶14The cases cited are Commonwealth v. Sires, 413 Mass, at 302 n.10; Commonwealth v. Donovan, 422 Mass. 349, 353 (1996); and Commonwealth v. Reed, 427 Mass, at 104.
¶15The rule was applied with limitations. “We [i.e., the Supreme Judicial Court] require, for example, that a homicide committed in the course of a felony or attempted felony, be the natural and probable consequence of the act. See Commonwealth v. Devlin, 335 Mass. 555, [567] (1957).” Commonwealth v. Matchett, 386 Mass, at 504-505. “The vast majority of felony-murder convictions in this Commonwealth rest on the inherently dangerous common law felonies of arson, rape, burglary, and robbery.” Id.at 505 n.15.
¶16Examples include, in addition to the Sires, Donovan, and Reed cases cited in note 4, supra, Commonwealth v. Pierce, 419 Mass. 28, 33 (1994); Commonwealth v. Nichypor, 419 Mass. 209, 217 (1994).
¶17The term “wanton or reckless conduct” is broadly defined in the leading case, Commonwealth v. Welansky, 316 Mass, at 399, as “intentional conduct, *220by way either of commission or [of] omission where there is a duty to act, which conduct involves a high degree of likelihood that substantial harm will result to another.” The conduct is defined, in other words, solely by its great propensity to cause substantial physical harm to another, and may include a battery such as the one before us. The word “intentional” refers to the act that causes the harm, not the harm itself. Id. at 398.