I remember David D talking about this and he would reply with "old enough" and he talks about to never giver her the answer she's looking for.

My usual response to them is I tell them to guess my age, that way I can find out whether she is trying to match my age with hers (if she's obviously older than I am she will usually guess high to match) or if she actually knows I'm young and is just straight up to the point. After that it doesn't really matter; either completely move on the subject or, as a retaliation, try to guess hers - usually higher than she actually is so that she feels that you are not rapport seeking in any sort of desperate way. Anyway, when they are + 5 years older than I am, I tease them by telling they could be my grandma, while of course, being all touchy and kino. I'm no Master PUA, but from my experience, the secret is to not be affected by whatever they tell you... Most of the times they are seeking your reaction to test your frame, and by ignoring her 'shit test' or whatever you like calling it, you put yourself in a superior position.

A good response I read from an inspirational PUA in this forum is, when they ask how old you are and they are clearly much older than you are, you say '18+', jokingly.

Best,

Notrya