I prefer maturity, experience, stability... Honestly, I spend more time with married women, and couples (When the husbands are into it too.) Youth are pretty. That's about it, with some exceptions, but by and large, they don't generally bring a whole lot more to the relationship. It's hard to even have a decent conversation with someone, who only has a decade of life experiences under their belt.
Especially with Virgins, I never really got the fetish for that. You basically have to teach them everything. I'll trade a young, lithe nubile pretty body for someone with wrinkles, and scars, who knows what she's doing. Any day of the week.
It's funny, because I typically write stories about Youth, because of the discovery. The learning, that gives something for the reader to discover, and learn. It's hard to write a married couple, that knows each other so well that they don't have to say anything, and still keep it interesting. (Granted, most of the LGBTA couples haven't been together as long as the straight ones.)