Developmental theories suggest that affiliation with deviant peers and
susceptibility to peer influence are important contributors to
adolescent delinquency, but it is unclear how these variables impact
antisocial behavior during the transition to adulthood, a period when
most delinquent individuals decline in antisocial behavior. An article published in the November 2009 issue of Developmental Psychology shows the results of a longitudinal study of 1,354 antisocial youth. The researchers examine how individual variation in exposure to deviant peers and
resistance to peer influence affect antisocial behavior from middle
adolescence into young adulthood (ages 14 to 22 years). Results showed that antisocial individuals choose to affiliate with deviant
peers, and that affiliating with deviant peers is associated with an
individual’s own delinquency. However, these complementary processes of
selection and socialization operate in different developmental periods.
In middle adolescence, both selection and socialization serve to make
peers similar in antisocial behavior, but from ages 16 to 20 years,
only socialization appears to be important. After age 20, the impact of
peers on antisocial behavior disappears as individuals become
increasingly resistant to peer influence, suggesting that the avoiding antisocial behavior may be tied to normative changes
in peer relations that occur as individuals mature socially and
emotionally.