I think I was climbing trees with a chainsaw when I was younger than that. We used wood heat and dad would pay us $20 a pickup load. Sometimes the best firewood was in a live tree especially when the stuff on the ground was frozen to the ground. I think he had us using a Poulan with a 12” bar. No PPE.
Fast forward 30 or so years and I was working as a tree trimmer being forced to wear hard hat and saw chaps along with a harness if off the ground. Made it a lot harder to work.