Congrats, you are now middle-aged!
I think last year hit me the hardest after realizing I have no friends, family, stable career, or savings, and have accomplished basically nothing and what I have accomplished was pointless.
It was all a build up of things getting better and better from 19-26, then afterwards each year got worse and worse. It's been a consistent downhill in all respects since 26 for me.
Your 40s and 50s are when you are supposed be starting to relax and confident in your skills doing your best life's work.