White married men 50 plus 60 plus. Some 40 plus.

Some fit due to the gym some unfit. Half and half maybe.

"Mine are usually middle-aged to elderly, white, professional or retired professional, rural-dwelling, divorced. Financially comfortable. Often with some health problems and like to chat."

Same!
Although the older guy is always who I have marketed to and as an indie I've never done quickies or low process and I guess it is younger men that go for fast and cheap.

I noticed on the anti-whore websites that research shows most men who "use" prostitutes are younger than 20-30. But I have wondered about this - what research? Admittedly, now I won't see young guys, but I have lots of experience over 30 years in various settings in England, including walk-ups and brothels, and in my experience, men under 30 are rare.
Rare enough to actually still remember them!

Mine are normally white middle aged, married men (who always stress they are straight!).
Lots of Asian timewasters - normally from viva street ads.
Very few blacks these days.

Mostly guys from 30 yrs upwards
I don't see very young like under 20s they are the worst time wasters .
I tend to usually attract guys who want an older woman
 

I noticed on the anti-whore websites that research shows most men who "use" prostitutes are younger than 20-30. But I have wondered about this - what research?

I don't remember reading anything that says exactly that. I've seen lots of speculation with all sorts of age profiles, but the statement above is almost the exact opposite of what I think is the case.

I think that most men once they start paying for sex never completely stop. So given that some do not even try it until in their thirties or forties, that means the typical age range is thirties and above, going on to seventies and even eighties in a few cases. Most of my regulars fall between thirty five and sixty five I'd say. Those that book three times a month or more are mostly in the middle of that range. Every client is different, so I'd find it hard to describe a typical one.