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U.S. Supreme Court · 2005
543 U.S. 551 (2005)
Held that the Eighth and Fourteenth Amendments forbid imposition of the death penalty on offenders who were under 18 when their crimes were committed (overruling Stanford v. Kentucky). The Court relied on three developmental differences that diminish juvenile culpability: a lack of maturity and underdeveloped sense of responsibility, producing impetuous and ill-considered conduct; greater vulnerability to negative influences and peer pressure; and a character that is not yet well formed and more transitory.
Some later courts have distinguished or questioned it — read before relying.
Treatment last confirmed July 18, 2026. Case-wide subsequent treatment; human-set. Not specific to any one passage.
Adolescents have a diminished capacity for self-regulation and impulse control relative to adults; the neural systems supporting cognitive control and behavioral inhibition mature gradually across adolescence and do not reach adult levels until the late teens to early twenties.
Adolescents are more susceptible than adults to peer influence and to external pressure or coercion, with susceptibility greatest in mid-adolescence; the mere presence of peers measurably increases adolescents' risk-taking and shifts their decisions toward immediate rewards.
Adolescent personality and character are still forming and are not reliable indicators of fixed adult character; most adolescents who engage in antisocial behavior, including serious offending, desist as they mature, so adolescent conduct is a poor predictor of irretrievable depravity.
Adolescents weigh risks and rewards differently from adults: a reward-sensitive socio-emotional system matures earlier than the cognitive-control system, producing heightened reward-seeking, a weaker orientation to the future, and steeper discounting of delayed consequences during adolescence.
An earlier age at first conviction or arrest is a significant predictor of persistent and violent offending among justice-involved youth.