Back in my late teens, early 20's, I could down a liter of vodka in a night and be ready to find more.... I honestly don't know how I'm still alive to be honest. When I think back, I realize I really shouldn't have made it to 25. That was 20 years ago now. I will do anything it takes to NOT revert back.
At some point, couldn't really tell you when, I just decided I didn't want to anymore. I never had a big event or anything, maybe it was just that my lifestyle changed, I'm not really sure. Now I have maybe a beer or two annually, so sporadic I can't even really remember when the last one was.
Don't miss it at all.