My friends are all fallig out with me over my bf?

It may not be up to you. They have their opinions and it's a free country. I think the age difference is sick myself, and I think you know it's wrong or you would have told your mother. Anyway, if you can't be talked out of it, then the best you can hope for is that your friends will come around again when they see that you and he are getting along just fine, with or without them in your lives.