Different stages of life? Not sure. He's in a very adult environment.
Other people have talked about the power difference - I'd say he was in a much more powerful position. He has fame, he has talent, and now he has money. Enough money to buy a house, outright, at the age of 16, if he wants to.
You don't know what their relationship is like. You don't know what either of them are like emotionally or whatever.
I've been in some absolutely shit relationships with people the same age who've abused me. I've been in some wonderful relationships with an age difference. It's not that bad. It's a few years. In a couple of years time nobody will even care.