When I first started at this job - 28 years ago (ick) - I could drink Friday and Saturday nights and two or three weeknights a week, and like you said, still do my job half-drunk in the mornings. Now I'll do so one weekend night, often with a break weekend here or there, and maybe go to a couple places and drink 5 or 6 craft beers then be home by 9:00. Of course some of those craft beers are in the double-digits in alcohol so I have to watch even that. :P But I don't really get hangovers anymore, though that's not necessarily a good sign.