Just to be clear, I don't support the "Only date girls 25 or younger" idea, I was just pointing out that it exists. I understand the philosophy, and how older women can be jaded. But if you date a girl, she's not going to stay the same age forever, so the idea is kind of silly unless you pump and dump.
Besides, I'm close to 60, I'd be narrowing my options quite a bit if I insisted on women only 25 or younger. Probably be a little hypocritical too. Anyway, I find a lot of women older than that attractive. At my age, most girls under 45 look pretty young to me.