I mean it's big. But it's not as big or crazy with some of the ones I hear on this site, so I'm not fazed. But big is not bad anyways. If you're committed to the person and both love and have a mutual trust for each other, I don't see a problem with the relationship
Not really. In some places you're of a legal age. MagiAlphaOne brought up the point of him possibly being old enough to be a dad, but in this case it couldn't be so. Take the person's age and subtract your own. In this case, you get 6. He isn't too old. If you were to subtract your age from his, and if the number is still greater than your age, then he is too old. Then of course, when you're an adult it won't matter at all.
It may seem big now but later on it won't. My mom and stepdad were 5 years apart and he and his second wife were 14 years apart. As long as neither of you have a problem with the age difference who cares what anyone else thinks?