I'm 28 and haven't been with a Man under 40 in a year. When I was owned, TheMasters were in their 40s and 50s. I just find Older Men much more Dominant and sexy. Especially if they wear suits!
The oldest Man I've been with was a year and a half ago and was in his 70s. I was loaned to him though. Not sure I would have gone for him if it was up to me. He was a sweetie though.
Meantime my gf is younger than me. So I guess I'm different with girls.