I feel for you youngsters. My son is only 28 and he feels he can no longer go back to his old life. Out with his mates, meeting new potential girlfriends, and no alcohol any more.
I think you would be forgiven for reining him in now and again. So long as he realises it’s because you care about him and his wellbeing.
Great that he’s be clean for so long though, but in my opinion, he needs to keep the meetings going. He can’t get lured into a false sense of security and take his eye of the ball.
Take care try not to worry too much.
Lx