I think it only matters in your teens. Like, a 15 year old and a 20 year old is obviously sleazy, but a 20 and a 25 year old is ok. 5 years is half your teens, so that's why I picked that number... Anyway. Once everyone is legal and has had some life experience, I don't think it really matters. That said, I think it says a lot about you though if you constantly go for people who you have a huge age gap with. Like if a guy significantly older always dates down, it screams man-child.