Cite as: 509 U. S. 350 (1993)
Opinion of the Court
That the jury had a meaningful basis to consider the relevant mitigating qualities of petitioner's youth is what distinguishes this case from Penry. In Penry, there was expert medical testimony that the defendant was mentally retarded and that his condition prevented him from learning from experience. 492 U. S., at 308-309. Although the evidence of the mental illness fell short of providing Penry a defense to prosecution for his crimes, the Court held that the second special issue did not allow the jury to give mitigating effect to this evidence. Penry's condition left him unable to learn from his mistakes, and the Court reasoned that the only logical manner in which the evidence of his mental retardation could be considered within the future dangerousness inquiry was as an aggravating factor. Id., at 323. Penry remains the law and must be given a fair reading. The evidence of petitioner's youth, however, falls outside Penry's ambit. Unlike Penry's mental retardation, which rendered him unable to learn from his mistakes, the ill effects of youth that a defendant may experience are subject to change and, as a result, are readily comprehended as a mitigating factor in consideration of the second special issue.
Petitioner does not contest that the evidence of youth could be given some effect under the second special issue. Instead, petitioner argues that the forward-looking perspective of the future dangerousness inquiry did not allow the jury to take account of how petitioner's youth bore upon his personal culpability for the murder he committed. According to petitioner, "[a] prediction of future behavior is not the same thing as an assessment of moral culpability for a crime already committed." Brief for Petitioner 38. Contrary to petitioner's suggestion, however, this forward-looking inquiry is not independent of an assessment of personal culpability. It is both logical and fair for the jury to make its determination of a defendant's future dangerousness by asking the extent to which youth influenced the defendant's conduct. See Skipper, 476 U. S., at 5 ("Consideration of a de-
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