I was about to write something similar. I had a big grill day with a group of friends years ago. They called me and the missus the babies. We were in early 40s and the ranged from mid 50s to early 80s. I asked them what the best life decade was and every single one of them said their 50s - “young and healthy enough to still do things with energy and limited aches and pains, old enough to know not to give a fuck!”