I’m 75, live alone, have balance issues, and had three TKRs (one a redo to clear up an infection). I was about 66 when I had my last one, and yes, healing is slower as we age, but I’d lean toward doing the surgery as my goal is always to keep moving. I’d get treking poles (4pt. suspension) and walk/hike on uneven surfaces as it trains the brain for the micro balance adjustments we need to stay upright. Good luck!