@saramg
I'm 43, and I feel this gradually coming since ~4 years.

The uneasy part (for me ?) is the "zero fucks" part:
letting go/dry the self-toxic fucks (easy example: the corporate bullshit), and keeping to give the ones that won't make me a senseless jerk. I've seen colleagues become so much jaded that they've transformed into jerks. I don't want that.