I'm in my 60s and have seen girls from 19 to late 20s without any indication that age was a problem. The girls are obviously not looking for a date, extremely happy to take the money and usually provide the expected services. I don't think their enthusiasm or lack of it has anything to do with a punter's age. So I'll carry on seeing that age range for as long as it suits me, and for as long as I can get it up