We used to have parties. But then my wife had a few realisations:

1. "I hate losing sleep, and there are very few things in the world now important to me than a good night's sleep".

This has been a life changer for both of us. I used to be a late owl, but when she started going to bed at 9:30,I did too. We now have competitive "what was your sleep score" in the mornings over breakfast

2. "I do not enjoy conversations with more than 3 other people at the same time"

I don't mind crowds and can "hold forth" with entertaining stories and have fun doing it, but my wife has social anxiety that really only emerged in larger groups. She doesn't even like going to parties or bars, and after a few drinks, leaves me to it.

3. "I don't like getting wasted, and I don't even like getting slightly drunk if it screws up my sleep"

For me it's more medical. While I'm perfectly healthy, I noticed around the age of 45 that red wine gives me palpitations and tachycardia. Lots of beer (especially really nice beer) does the same. My father is 99 years old because he never drank alcohol. I honestly believe a single hangover would actually kill him. But certainly, years of "not kicking the shit out of his insides with booze" have contributed to his long life.