Finding the right pain meds that work for you is a biggie. I take Cymbalta — which helps with pain as well as with depression (which is aggravated by pain). I’ve taken diclofenac for years, and it’s the only NSAID that works for me (and I think I’ve tried them all!) Acupuncture may help you ---- it helps my arthritis. There are also lidocaine pain patches that can help a lot — you can wear one up to 18 hours a day right over the areas causing the pain.
What they say about the age for various replacement surgeries isn’t really gospel. I had both of my knees replaced before I was 50. Made a huge difference.
Be sure you get a good orthpod. My mom had a knee replaced by a total jerk — he was a druggie who was arrested shortly afterwards for DUI, possession of crack, possession of paraphanalia, etc. — she ended up unable to walk even after another doctor tried to correct the mess the first one made.