Meh, I'm not sure I can put a hard limit on it. I mean, if I go ahead and say five years, what happens if I meet someone with seven years difference? *Shrugs* In practical terms, I doubt I'll be in a situation to date anyone more than two or three years outside my own age though. (Two or three years younger is almost certain to be the best pickin's for me as well, due to being a little older than most at college.)