I am seventy years old and will soon be seventy-one.
I punt, on average, three times a month and almost exclusively with the same lady. She has told me that I am not her oldest punter and I have no reason to doubt her.
From my late twenties until my mid-sixties, I punted far more frequently and with a variety of "regular" ladies.
I have never been married or fathered children. However, I have had two long-term relationships (not living-in ones) but continued to punt throughout them. Fidelity has never meant anything to me: punting usually gets me precisely what I want, when I want it.
Establishing an average age may not be that easy, but I'd hazard a guess that between thirty and fifty-five might be reasonably accurate.