Marmalade, 25? Are you serious? A woman is "past it" when she is 25? Jesus.
I think my nicer, friendlier clients are always those who have a wide range of ages/sizes they would find attractive, and like to 'try out' different types. It's usually the mean , cold and rude clients who have a FIXED, IMMOVABLE "MUST BE" list (like MUST be size 6-8 with tits like bullets and 18-21, or MUST be a milf aged 50-55 and not a year younger). Didn't mean specifically you Marmalade by the way, just my experience that friendly pleasant people are usually open-minded, and nit-picky and closed minded people are not usually fun to be with.
I don't pay for sex (I might if I were male, but no inclination whatsoever as a female), however in my personal life I am attracted to a wide range of men, from around my own age (early 20s) to 60s (google DANNY TREJO, I quite like him). From slim guys (that guy who was in Royle family - Ralph Little i think) to bigger guys (Robbie Coultrane). I don't see the fascination with a "shelf-life". There are attractive, magnetic people everywhere - including those who sell sex - if you open your eyes.