To me it doesn't matter whether it's realistic or not. For me, it's misogynistic to constantly see young women and older women as love interests in movies. It's a lot more rare to see the reverse. When you're constantly shown images that only young or younger women are desirable, it definitely does a number on our collective psyche. When women get to a certain age in Hollywood and they become sexless matriarchs, but Sean Connery and Jeff Goldblum and Alec Baldwin can play love interests in their 60s and 70s, it sends definite messages about what women are worth to society and that people would rather not see them fully as human.
Women shouldn't be playing the mothers of actors who are the same age or 1 year younger than them, yet it's happening all of the time.
Whenever I bring up this discussion, someone always says "But Meryl Streep blah blah" and I just roll my eyes because Meryl Streep is like the best actor. Not everyone woman is the best actor on the planet. Of course she'll get some opportunities that 99.99% of women won't.