I'm early 50's and the youngest woman I've been with (at this age is 20). This was in the civvie realm. Youngest provider was 24, and wasn't that great, but that was more about personality than age. I've talked to a number of (civvie) gals in their 20s who have been with older guys and really like it because there's an experience factor in the bedroom that they've never experienced with guys their own age. Such an awareness is gratifying to an older guy.
I think it's pretty interesting this conversation is taking place on a hooker board. Take the average person on the street, and they will tell you that having sex with a hooker is disgusting and low life. I don't know how many conversations that I've had to bite my tongue as a part of, because I did not want to blow my cover.
Norms of ages that should be together are a lot broader than are being discussed here. Personal preference is another thing. I respect that. And I certainly respect the legal age of consent thing.