I don't understand how people do it. I'm not even that old yet (almost 31) and I can't keep up with the drinking and partying of people who are 40 and 50. Was at a conference for a couple days, I had about 3.5 "beers" (1 12 oz and 2 pints) over 4 hours or so, went back to my room at 9:30, and was feeling pretty buzzed and pretty exhausted.
The rest of them were at the bar until 1 AM. I just don't get it. It seems like everyone except my wife and I lives on caffeine and alcohol, and we don't drink either really ever (a six pack lasts me 2 months).