We would be happy to be starting to fall apart in our 60's or 70's.
DH had spinal surgery 14 years ago on his lumbar that turned out pretty well. That's when he was 40. But now, he will be having c3-6 fused the beginning of next year. Neurosurgeon told him if all of a sudden he pees himself, get to the ER right away
I destroyed my left SI joint 3 years ago. I let it go for 2 years, now at 47, I am looking at a rod through my hip and a cage on my spine.
So, we will begin full timing with these ailments next year. Figure we better leave asap, or we might never be able to!
Best of luck with your knee.