Mine are, maybe others are as well. Knees suck. My knees have done a remarkable job keeping me jumping up and tapping signs for many years but time, being overweight, and genetic disposition have taken their toll. Now the only question is when should I get the nice shiny titanium ones
Sure there are a few people with genetics that just give them shit joints/cartilage/etc, but most people that’s not the case, they just have to take the maintenance and strengthening of their joints as a discipline.
I’m not saying I k ow who is gonna need a replacement or not, I’m saying for the vast majority of folks, improved physical wellness is accessible and realistic, and that it’s habits (like office work) and choices (like not incorporating exercise and stretching, drinking alcohol, etc) that are the chief limiting factor. Not age.
Edit It’s totally possible that you are of the minority where physical wellness routines and physical therapy aren’t gonna cut it for you. Good luck