Not all "classics" were written a long time ago, though. Nineteen Eight-Four was published in 1949, The Catcher in the Rye was published in 1951, Catch 22 was published in 1961 and and Slaughterhouse 5 in 1969, just to pick a few off the top of my head, and it's unlikely that you'll find any commonly-accepted "classics" written later than that. (This doesn't apply to individual genres, of course.) Yet this was in an era in which women writers were far from unheard of, and in fact often very popular. Agatha Christie was one of the most widely-read English-language writers working in this period, for example. So something isn't quite squaring off, there.