There are a lot of moving parts in this question (at least for me).
I think women peak in sexual drive and appetite at 50 +/- 10 years or so -- anywhere from 40 to 60 with the high point on the bell curve being right at 50.
Then there is the old saw ( I think it is French ) that the ideal age relationship is "Half. Plus 7."
So for a 60 year old, it would be 37. Whereas for a 30 year old, 23. There's merit in this one.
When day trading has gone super well, there's always the solution of doing it all. A FMF 3-some of a 20 something and a 40 something. And when you collect the get out of jail free card and pass go and there's a special dividend -- a foursome. Three women -- 20/40/60 . . . That I haven't done yet.
Of course, I'd throww all of that away if I could ever find this:
A pair of identical twins, petite, blonde, 18 to 22 years old, all natural, greek friendly and pregnant. (All four pregnant much preferred, but will settle for only three.