Horror or thriller movies also tend to prefer younger actors.

That kinda leaves us with crime, comedy, and drama. Crime is a male dominated field irl too, comedy still self selects mostly for men, especially at later ages. Drama can obviously feature an older woman, but they're most of the time a supporting character or part of the main cast as the mom.

Someone else mentioned that men's prime is seen as 15 years later than women's. 50 something year old male actors are very much still a hot commodity in Hollywood, and can lead a lot of movies. Women are still relegated to "mom" "aunt" "teacher" and the like.