The present study examined the longitudinal course of men's physical and psychological aggression toward a partner across 10 years, using a community sample of young couples (N = 194) from at-risk backgrounds. Findings indicated that men's aggression decreased over time and that women's antisocial behavior and depressive symptoms predicted changes in men's aggression. This suggests the importance of studying social processes within the dyad to have a better understanding of men's aggression toward a partner.