Btw, I'm in my mid forties, rarely visit anyone older than mid twenties and have never felt the need to tell them my age before going.
I never thought about it but I suppose I just sub-conciously assumed that they would be seeing all sorts of ages, shapes and sizes and that it wouldnt be an issue.
Unless of course I am in fact a dribbling pervert and I have up to now had a mental block on the subject as a sort of involuntary denial of my dribbling status.