This study examines the relationship between age, gender, and marital aggression by comparing conflict resolution strategies, physical aggression, and injury across 6,185 married young, middle and older aged men and women. We found a consistent age effect such that younger participants used more maladaptive conflict resolution strategies, engaged in more physical arguments, and sustained more injuries than older participants. In terms of gender differences, women compared to men used calm discussions less (the least reported by women who were young) and heated arguments more. Analyses on the relation among age, gender, and injuries showed that more young and middle-aged women than men reported that they had sustained injuries at the hands of their spouse and more young men than women reported inflicting injury on their spouse. The results are discussed in relation to research on gender differences in intimate violence and the association of age and intimate aggression in general.