Hi, Bill!
I'm 48 and I have my share of physical issues as well. The old injuries from playing football and military service have finally caught up with me, so I understand the challenges. Arthritis has set into my joints, making it difficult sometimes to handle small parts. I'd dislocated a hip back in my twenties, so sitting at the bench on those days where it flares up very uncomfortable (you should hear that thing pop when I go to stand back up!) after a few hours. Two years ago, I suffered through what the physicians tell me was a 'transient ischemic event' that was, in effect, a miniature stroke that left me legally blind and cross-eyed for seven weeks. I've since also managed to add what the neurologist calls a 'necessary tremor' in my hands to the list. All of it is attributed to aging by the doctors, making me question their competency.
How do I deal with it? I try to follow the medical advice I was given for changes in diet and exercise to keep the joints functioning a little while longer. I bought new furniture for the shop, including a new chair that helps take the pressure off the bum hip and lower back, plus it has wheels to help me zip around like I was five years old again. I also bought my old jeweler's bench from an old employer who was retiring from business.
The bench has changed things for the better. The bench pin projects out, allowing me to brace my elbows on the edges of the pan below and to rest my wrists against the pin. It helps to keep my hands steady on those days where the tremors set in.
I've upgraded the lenses on my Optivisor to compensate for my vision and begun wearing glasses to ease the strain. I've also added a lot more lighting above the bench to help things out. A new Panavise is also on the bench, as well as clamps designed to hold figures in place for painting. I watched a friend of mine who owns an art gallery use her left hand to brace her right while she painted and lettered a postcard sized portrait, so I've adopted her approach and it works like a charm for me.
Keep doing what you love, Bill, and stay optimistic - you're going to find the answers and maybe even create new solutions as you go along!