[Tinner666]

"I have noticed one thing however, their mobility is much more limited than before. No more long hunts or hill scaling. They hunt closer to camp and in a less rugged terrain. They also use natural blinds."

I think it's mental, not physical. Some people that have this kind of trauma for the first time in their life let it get to them. I know of people like myself that just continue on after open heart, triple bypass, hernia, back and other surgery.
I know some that have sat on the porch waiting years to drop dead from it and are otherwise healthy. If I get to that point, life has truly ended for me.