I think a lot of people work hard all their life, only to find themselves prisoners of a weak old body. They didn't enjoy life along the way, and now they can't. So, what's the purpose of continuing onward.
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I am dealing with this by changing my expectations. As wrenching becomes too difficult physically, and driving time in the P-car has all but disappeared, I find that I can still shoot (and well), but not all the same pistols and calibers as before. I continue to reload in my shop and to make (mostly 1911) grips. As the arthritis and leukemia progress, I will re-start my watercoloring hobby and hangout on the internet, esp. Pelican.