All moving parts degrade. A nice thing about machines is you can service and refurbish them to like-new condition.
There are options to deal with your shitty knees, hip, and back, but none of them get you back to 100% of your original capabilities and, carry an element of gambling, and will involve the kinds of painkillers that can ruin you far more comprehensively than a shitty joint will.
There are options to deal with your shitty knees, hip, and back, but none of them get you back to 100% of your original capabilities and, carry an element of gambling, and will involve the kinds of painkillers that can ruin you far more comprehensively than a shitty joint will.