wierdness

I just found out that one of the girls I went to chiro school with is marrying one of our old professors. Don't get me wrong if they are happy then I am happy but a small part of me is totally weirded out! She is my age and he has to be around 60 and has a daughter about our age. Really it is not even the age difference as much as the fact that it was our teacher. I just struggle with the idea of going from Professor can you help me dissect this to Professor do you wanna make out...........(I doubt it really happens quite that way but you get the idea).
Anyway I wish them all the best!