i always figure about 47, I mean i've seen a woman who I figure may be near 50 once or twice who was just a total fox! I don't really discriminate although in the bigger picture I don't exactly imagine marriage.
I'm 22 and probs wouldn't go below 19 because then I'd be dating teenagers/children. I've known girls my age and younger date 10 years above, though at the moment I'd probably date up to five years above.
17, I'm fine with anything up to 1 year below and 2-3 years above my age. People younger than 16 are just irritating to me and people older than 3 year above me would have too high an expectation of me.
I don't know how qualified I am for this answer. When I was 16 and a junior in highschool I met a freshman who was 14 and that was basically as far as I was willing to go. People still called me pedo and stuff. So I would say that 2-3 years is my max.