It is not the norm but not legally wrong. Morally? I'm not sure I (or anyone else) should be the judge in this case. I certainly won't want my daughter in a relationship like yours when she gets of age. Thank goodness she is still too young for me to have to worry about boys!
Regardless of what anyone else says or thinks about the relationship, you are the one in it. It doesn't seem like you think it is right or else you wouldn't be asking. You have to be your own moral compass and do what you think is right. If this relationship does feel right don't let judgemental people wreck it. They aren't in your situation and have no clue what common ground you may or may not have with this young lady.
Best of luck to you!
Okay, she is a consenting adult. She can do whatever she wants, even if that's you. It's not wrong as long as you're happy. Why should other peoples opinions matter in your relationship? It's between you and her only. If she made the first move as well, I wouldn't worry.(:
she's in it for the money, the happines, the experience, or because she is bored . most likely.
to me.. as an outsider.. who doesnt get affected by your relationship.. its not wrong. but more than likely there will be a time where she will move on maybe to a younger guy or one with more financial bonus to her . not all girls. but maybe her.