I'm not going to invite my childhood friends to my wedding
Why won't you invite your childhood friends to your wedding?
Childhood friends are better off forgotten and I don't get along with them anymore.
It's fine to only want to invite your current adult friends to the wedding. Sometimes childhood friends grow apart and that's okay.
I can invite whoever I want to my wedding so it's going to be my friends. I don't care about those that were not invited.
You may not care but if you're still in contact with a childhood friend regularly, they might be expecting an invitation. Letting them know why they aren't invited is the kind thing to do. Wouldn't you like it if someone was honest with you?