I'll be 18 in three months so..

I've been with my boyfriend for almost a year in April. We've done just about everything and I'm pretty mature for my age. We connect and bond like no other and I don't feel like it's wrong at all. We motivate each other every day to do the best we can for a great future and I appreciate and love what we have. I'm not going to break up with him because I don't think it matters but I wanted to know if you think it looks bad. I'm 17 turning 18. He's turned 22 in December.