We drew from developmental theory regarding the timing of historical events in individuals' lives to examine age-related differences in self-reported masculine, feminine, and androgynous personality traits in a cross-sectional sample of American men (N=357) and women (N=404) representing six age groups (adolescents [12-17 years], younger [18-29 years], middle-aged [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59], young-old [60-69], old-old [70][71][72][73][74][75][76][77][78][79], and oldest-old [80 and older] adults). Oldest-old women were less likely than younger and middle-aged women to endorse masculine and androgynous traits. Men in their 70s (old-old) were more likely than adolescents and younger men to endorse androgynous traits. Discussion of the results emphasizes the implications of the second wave of the women's movement for understanding life-span gender development.