When is it an issue, and when is it not?
For me, I've experienced it being an issue, in the sense that when a girl is too young, it's best she stick to people around her age bracket because the maturity level is just not where it needs to be.
For example, I recently became a bit entangled with a friend who's 19... and I realised, you know, I'm 24 - it's just not going to work..
Thoughts? Experiences?