Age differences start to make less of an impact as you age.
The age difference between 35 and 49 is totally different than the age difference between 16 and 30.
I'm only 23 and already I have nothing in common with the sixteen year-olds I meet; I can't imagine being friends with them, let alone having a relationship with them. I can't imagine being 30 and trying it, you're just at entirely different stages of life at that point.
I would say there's something inherently skeevy about a 30 year-old making passes at a 16 year-old (any sex).