I have had 14 surgeries,and an implant in my back. Had my neck fused. I'm always in pain to one degree or another. Had an epidural in my back just yesterday. I have cataracts in my eyes,though I can still see what I'm doing. I need lenses in my eyes.
It doesn't mean that I can't do my work. I'm nearly 70. If some younger person thinks he can go on forever,it's because he hasn't gotten old yet.
As a young person,we lived a real pioneering life in Alaska. I spent my spare time and Summers carrying lumber up a long hill, building a house,clearing out trees,sawing up logs,drilling holes with a hand cross handle auger to set dynamite into stumps 2' deep, digging a 500' ditch 4' deep with a mattock to bury the water pipes deep enough that they wouldn't freeze,and carrying oil up the hill at 5:00 AM before walking to school. Lots more than that,too.
My skeleton got pretty worn out,and now I'm feeling the effects. I used to be 6' 5". Now,I'm only 6' 3".
My mother was a maniacal perfectionist. All that stuff made me learn to pay attention to detail,and be persistent.
I can still handle my 115# milling vise,and lay down a 20" Delta bandsaw(with table removed) and set it back up. I'm restoring it. Not things I want to do often!