With age.. it depends. 14 and 16 isn't too bad (That's like a Freshman and Junior dating.. don't know where you're from though) but if you're a Senior and screwing 12 year olds, then yeah... I think that's a problem.
We kind of have this 'stupid love' thing in my family. Anyone who married someone rather older, didn't go over so well. Got beat, bad relationship (partner was a druggy or something) or just didn't like them after a few years. But yeah, my family is seriously messed up, so they're nothing to go by.
((Just a disclaimer, I don't want to get flamed because someone mistook it.... stupid love as in just went with them "just cause" or money or nice cars, promised a better life, etc.)