I think that once you reach past thirty the age difference don't matter. There's just too many child molesters out there who are like 40-50 years old going after kids that are still 18 or even in their early 20's. That kind of thing I have a problem with just because a lot of times those older men/women are just messing around and manipulating the younger person. Yes I do consider someone 18 to still be a child even though legally they are an "adult".

However once you reach 30ish you should have enough life experiences to know what to watch out for so that's why I say age does not matter after that point.

I tend to go for people a few years younger than I am. I have no idea why it always ends up that way though. I have had 16 year olds ask me out and I'm 26. I stay away from even hanging out with kids that young.