I had Sciatica when I was younger, and there are parts of my leg and foot that are completely numb as the nerves in them must have just given up the goose! Despite the Sciatic pain being gone for many years now, I do still get very stiff down my left leg, pins and needles a lot of the time and achey in very cold weather, so I do try and still do the exercises that I learned with my back years ago!
I have also asked my family a few years back to put down carpet for me, as before I had laminate flooring, and it didn't agree with me at all. I much prefer the sturdy non-slippiness of a warm carpet!
And lastly of my beautiful dogs, my young neighbours take my larger dog out for me, so I still get my exercise with my little Jack Russell, but my huge Border Collie gets a good run with the neighbours kids who love taking the dog and a frisbee onto the fields and having a run about! This has saved my back alot as my Collie Ben is almost 17 years old and because he's such a big dog, he can unintentionally pull me, so the children helping have saved me from some pain!
Getting older sucks, but as long as you are sensible (not all the time mind!) and make sure things are safe, you can still enjoy all you did before!