I had a TKR 3 1/2 years ago at age 68. It was semi-necessary, that’s how I would put it. Progressively increasing pain, cortisone injections did not help, neither did exercise, scope surgery, other injections. Extremely painful to walk down stairs, down any incline, even just regular walking. If I would have been a decade older, I might have accepted the limitations, become more sedentary, given up on a more active lifestyle, and not have the surgery. In my case, I decided it was worth going through the pain of rehab, and deal with a few limitations of the replacement knee, but basically it works 85% to 90% as well as the “original” one. Every person must consider their own situation, and definitely check out the surgeon as well as the type of procedure and type of replacement knee. For me it turned out well.