A fourteen year old and a 20 year old.

[Ultra]

A 6 six year age difference like this is possible and it is feasible. You have to be super ultra mega careful right now though. I had to do it when I was in my relationship, except it was 7 year age difference and he was very close to being 18. One warning that I'll have to give ya and hopefully this won't happen, he may change a lot when he's almost of-age or at that age. That's what happened with my partner, it's like he outgrew me (when in fact he didn't). It can really really be devastating. Good luck with this!