Potential boyfriend?

There's this guy I really like him, I'm pretty sure he really likes me as well. But I was wondering how long should it take for him to make it "official" I'm not in a rush but I definitely don't want  to wait so long. So please tell me what you personally think about how long I shoudl wait?(: it would help. By the way I'm 19 and he's 19, if that matters. He's very kind to me.