I don't think age is relevant, and I'm not sure the income is either. Unless the agreement beforehand is that everyone pays for self, then whoever invites the other should pay, IMO. According to what I read in an old 1950's-era dating manual for teens, though, if she wants to save his face in public she can slip him the cash discreetly before they go out, and he can look like he's paying.

I agree that you've got a good one if she's willing to pay her share, and that men shouldn't have to pay all the time just because they're men. Gender is irrelevant too, just as age and income are. My husband's ex worked at the same place he did, and had a comparable income. But in her way of thinking, paying bills was his responsibility. She actually said, "The man is supposed to take care of the woman." The money she earned, she spent on her own enjoyment, and wouldn't do a thing to help run the household. I don't think that's right. If we're equal, we're equal. Not identical, but equal. We can't have it both ways, insisting, "I should earn just as much as a man does," and then then turn right around and say, "The man should take care of the woman."