When I was your age I had a boyfriend 20 years older than I was too. Think about the whole picture; whether your parents and friends and his friends and family will all like one another and get along. Think about if he has had wives or children and how old they are and imagine how it will be in 20 years, etc. I found, at the time, that I would "skip" over some of my feelings because of my love for that boyfriend. But he had different ideas of what he wanted and I ignored that too, trying to stay "present" like all the difficulties of loving someone that much older would never really happen.

You have seen how your own life and interests have been affected by dating him; I recommend not giving yourself up to the relationship but keeping "yourself" going as if your life might be different in 2-5-10-20 years. Keep working on getting a degree and a job, etc. and developing yourself. My husband is 7 years older than I am and I'm 60 now and even that seemingly "small" difference in age is making a difference in our energy levels and what we feel like doing, etc. My husband had three sons already when we married and he wasn't interested in more children, said it was "up to you" but I didn't want to be raising children whose father wasn't that interested in them and whose half brothers were 20 years older than they, etc. My advice is for you to look at the whole picture and not try to make light of the differences.