A: There is prob nothing to this, I am in a situation that one of my close friends is dating my ex, there are no feelings between us and all is going well, this maybe the case here. Don't worry about it.
A: Not at all! If the two of you like each other, want the same things out of a relationship, have common interests then I don't see the problem with an age gap. I know lots of couple who have a similar age gap and they work out fine together. Age doesn't matter only compatibility does.
A: Yeah it sounds to me like he is interested. He has mentioned a couple of times that he wants to do something with you, so if you like him then suggest something! I know you are leaving town but you might regret it if you don't give it a shot, best of luck!