If I can be 20 again, I’d date a 30 something guy at that age. (I’m 37 now :) Men mature emotionally much slower than women.

That’s so true.
But please don’t forget what it sometimes feels like when being hit on by a guy who’s ten years (or more) older than yourself. I do believe that later on it doesn’t matter that much anymore, I’ve a friend who’s in her early fourties (very attractive) and who gets hit on by younger and older men, to her it isn’t that much a problem.
I know however what I feel like when being grinned at and hit on by someone whose age difference is so very obvious. I’m 23 and sadly guys who’re my age are pretty shy (they wouldn’t admit it but it’s true) still I feel really awkward and sometimes disgusted when a much older guy hits on me (just a few weeks ago some really weird guy in his late fifties tried his luck).
Probably I feel this way because I believe they’re only after some affair… I don’t know…

I totally get what you mean @vipra