The current correlational study examined the individual (self-regulation) and social (self-construal, parental practices) antecedents of social value orientations (SVO) among middle adolescents and emerging adults. The sample consisted of randomly selected 218 middle adolescents (ages 14-15) and 219 emerging adults (ages 19-25) and their parents in a metropolitan area of Ankara, Turkey. The results revealed that emerging adults have more prosocial SVO than adolescents. Young people's SVO scores were positively correlated with parental autonomy support and interdependent self-construal. The moderation analysis indicated that the association between parent- reported high autonomy support and young people's prosocial choices was stronger for young people high in interdependent self-construal. The results also showed that parental autonomy support was related to increasing internal self-regulation of young people in prosocial issues (such as cooperation, helping and sharing) and increasing prosocial choices of young people in social dilemmas.