Both my partners have been 12 years my junior. (I think it has something do with the time it takes Jupiter, or some planet, to orbit the sun)

When I was 53 I had a sex with a 21 year old. I think that was the youngest. (Well, when I was in pre school, I played with other pre schoolers, but that doesn't count).

In my 20's, back in my bookstore and video arcade days, during my almost daily visits I would always make it a point to suck off or play with one of the very old guys hanging around. It was a karma thing. I knew someday I would be an old fart and I would want some young guy playing me.