Okay soo theres kind of an age gap?

okay well me and this guy have been talking foreveerrrr i'm 15 and hes 19. i know it may seeem like he just wants me for but he doesnt. hes reallly nice and caring and we've hung out a bunch of times. i've told him repeatedly i'm not having with him and he cant talk me into it. he understands and respects my boundries. hes also met my parents. he has come over for dinner and has been out to eat with us. we went bowling once and also went to grove city once together. my parents seem like they trust me and him and all but they havent really mentioned there approval. so what do think?