Particularly once they reach thirty, these women are the most "review-sensitive": a chorus of critical praise for a movie aimed at (women over 25) can increase the opening weekend's gross by five million dollars. In other words, older women are discriminating, which is why so few films are made for them.
From the article about movie marketing in this week's New Yorker titled "The Cobra."
I maybe see 3 or 4 movies in a theatre per year. This year I saw 4 - Indiana Jones... ugh, Wall-E - pretty good, Man on Wire - good, and Milk - great.