Sounds to me like he's interested. Try picking up the pace a little, flirt a little more. Or you could ask him out, casually, nothing romantic. Just spur of the moment kind of thing and see if he goes for it. If he does? Great! If not? His loss.
As for the age difference? A friend married a man 11 years younger than her and they are one of the happiest couples I know.
Good luck!!
