When did you start to “slow down”?

So you always hear about how getting drunk on a night out with your friends starts losing its appeal as you enter your 39s, hangovers gets worse, etc. The thing is, I’m only 22 and already starting to feel this way.

I’ve been in college, so I’ve been in the pretty typical college routine of going out a few nights a week and getting decently drunk. However, I’d say about 5 months ago or so, I came to the realization that I simply wasn’t enjoying getting fucked up the way I used to. Getting drunk just didn’t feel… nice (I genuinely can’t put words to it). I started sleeping less well if I drank a lot that night. Hangovers started hitting heavier. These days I don’t go out as frequently as I used to and when I do, I very rarely get properly drunk, maybe just tipsy.

So what gives? Is 22 the magic number?