17!Year Difference

When I was 18 I hung out with a older crowd. Through that crowd I met my best friend Kenny. At the time he was 35. We've always enjoyed each others company, and have always been there for each other when needed. I Never once had the intentions of crossing that boundary. He got me one of the bet jobs that I could ever want. Feelings have always been one sided for the 3 years that we have been friends. He's always liked me while I felt as though he's too old. I am now 21 and he is 38. I see him everyday, always joking and lately I'm getting feelings. And it's escalated throughout the week. We both feel the same way. Is it bad I like my best friend this much?? Considering his age??