Men's gender ideologies have changed more slowly than women's since the 1970s; this article analyzes the period and cohort processes that underlie men's attitude change and how the individual-level characteristics of conservative men differ by birth cohort. Using multidimensional measures of gender role attitudes from the 1974-1998 General Social Surveys, the author finds that changes in men's attitudes have been brought about both by period influences, especially during the 1970s, and by cohort replacement. Analyses of multivariate interaction effects demonstrate that (...) education has become a much less significant predictor of attitudes for men born after 1945. (shrink)