I had tendonitis and was getting injections in my right thumb and discovered custom controllers which has taken a lot of strain off my hands and extended my gaming life. They’re pricey but well worth it. I also found a coupon via Honey for 80 bucks off the one I ordered from AIM. Well worth looking into if you’ve got arthritis or other hand issues.
I got my first Linux system two years ago when I was 57. I took one of the COVID checks and bought a Linux laptop from System76. I had the choice of PopOS or Ubuntu so I just took straight Ubuntu. It was set up and running when I unboxed it and everything I need to know how to do I can just do a web search for. And that’s really not much. Best of all the thing starts up in seconds, when Windows was always taking its damn sweet time and shutting itself down for two and three hour updates when I needed to use it. As for gaming, that’s what my PS5 is for.
Buying a pre-built, pre-installed Linux system was perfect for me. It might be what would work for you too. It takes a lot of the guesswork out of where to start.