Well I'm 20, so for dating I like a guy thats between 24 and 30. For intimate encounters it really depends on the guy, late 20s early 30s is hot, but I have met some very handsome over 40 gentlemen aswell
my wife said that when we were in our early 20s she fantasized and flirted with guys over 40... now that she's 27, she likes younger guys.
my guess is that her fantasy is just an escape from who i am... you know, for flavour. i know the truth is age don't really matter... so long as it's an age that the guy can perform... that's more important.
At least not many who are attracted most to 25 yr are gonna speak up since the avg customer is older. Some might even (gasp) lie and say they best like their target demographic.