I'm in my 20s, so I sometimes find girls who won't see guys younger than 30. I could probably pass for 30 but it's not worth the girl turning me away if she asks to see ID.
Don't understand a girl who imposes age limits (besides the obvious legal one of 18+) - surely that's just a girl turning away good money. In my example, my money won't become more valuable on my 30th birthday, likewise if there's an upper age limit that person's money doesn't become less valuable on their 60th or something.