[steven]

I think it's fine. My wife is older than I am and things are fine. I've dated people younger than me and older than me and I have to say that older women were easier to get along with.

Just one thing: if things get serious, make sure you talk about having kids. I think that's where an age difference like that comes into play. He may feel like he's too young to have kids... meanwhile you could become unable to safely have kids.