Glad to hear you are on the mend.
I've had both hips replaced and partials on both knees. I am doing well. I get stiff if I sit for an hour though but once stretched out I am fine.
As far as hips and knees go my recommendation is to do it when the pain impairs your ability to stay fit, don't wait until you are invalidated. Then get right back to your favorite form of exercise. For me that is swimming.
I'm 70. Besides the ones noted above I have had rotator cuff, cataracts, hernia and prostrate reduction. Only my left hip done at age 68, hurts more than it should I think. All the other stuff is working as advertised and in most cases as good or better than original equipment. If I were a car I would be a rat rod as all the important stuff has been repaired whenever it fails but I still look 70 on the outside.
