I am 69, I have MS, I have creaky joints, and I try to ride three times a week (30 minutes a time since I have NO endurance!)
As for creaky joints the BOT products have really, really helped me. For instance, for my hip bursitis I wore BOT boxer shorts for years, and this year my hips finally stopped hurting completely and I have not worn them for months. I was not doing anything else specifically for my hips.
My back used to really bother me while riding. The BOT “super” back brace helped me ride for years, and because of its help my back got strong enough so it often does not hurt me for months. Again this is after wearing the back brace for years whenever my back hurt (often).
Since I am a special case for my lesson stable I bought a three-step mounting block and just gave it to the stable. My condition was that I had first dibs on the mounting block if there was a line. It helps my hips that I don’t have to haul my body up as high. My riding teachers’ little students also appreciate it. It has been a gift that has brought me good will from the stable people.
I prefer riding horses and ponies from 13.3 hands to 15.2 hands. I will ride a taller horse but dismounting is more challenging since it takes longer for my feet to hit the ground as I slither down the horse’s side.
You can get back to riding fine. I did and I was probably worse off than you are now with my MS, arthritis, bursitis and all (if you are worse off my apologies.) Now I am MUCH better and much of that is because I am riding regularly again and getting lessons.