40 was no big deal.
50 is a big effin deal.
It’s all over after that.
When I was 40, I was in the best shape of my life. I lifted more weights at longer reps than I ever had before, and still weighed what I did when I was 21. I turned 50 and parts started to fall off. When I was in college, “pulling an all nighter” meant staying up until sunrise to write a paper. Now “pulling an all nighter” means not having to get up to pee.