Well jay for someone who isnt attracted to this girl you sure seem hooked, lol. You cant go through life pleasing everybody but yourself. If you like this girl then why care what others think. She sounds fun and willing to accept you as as is so you should do the same. So what if she looks younger than she really is, most of us older people would consider that a compliment. Hell, they never ID me anymore
Also, while its nice to have friends they dont always know whats best for us. Most people in or fresh out of high school live in a fantasy world anyway thinking looks and popularity rule when really, they dont have a clue about life. Its really up to you but there's no way i would let something this small cloud my thinking or judgement.Damn it man, i sound like a parent.