You've got it!!
I don't know what age I'd like to be. Not the teens, certainly. I used to think 29 was the ideal age, but I have second thoughts on that one. Maybe a healthy, wealthy 40+?
George Bernard Shaw said "Youth is wasted on the young". Does he have something there? I remember as a kid, people would say "If only I knew then, what I know now." or "If I could be that age, but have the know-how that I have now."
Whatever age -- make the most of it and enjoy it, and keep on enjoying it right into old age --sex and all!