I voted 19-25 and 25-30. Kinda like Roger. I want what I missed out on when I was younger. I know all the stories about immaturity and certain attitudes with the younger ladies, but there is something about being with a hottie fresh out of school or college (or even still in college). Nothing against the older ladies, I still love you and will still see you as well.
Age is not a factor with me, it's maturity (plus appearance certainly helps) that excites me. That can be 18 to whatever! And still know how to have a good time.
Though I have met a few at the high and low end of the age limits that, I won't say make it hard, but made it difficult to fully enjoy the experience b/c of the maturity factor, I don't know, maybe I'm just getting old?