Ever since I was born, I've lived very comfortably in my own company. I've always been able to entertain myself.
When I met my wife and decided to marry, I always felt that things outside of myself were an annoying distraction from the things that really bring me contentment.
So I've spent the years after my wife died and my kids grew up, trying to get back to the quiet solitude that I've always considered my place in life.
I enjoy favorite music, favorite TV shows, word puzzles, reading internet forum posts, trying to make people smile who read my posts.
I enjoy people in small doses.
I still work from home with my favorite computer aided design/drafting application. I get 5 weeks of vacation time which I like to take as Fridays off.
I drive on occasion when the mood suits me.
I do my laundry at a laundromat so I get out of the house and interact with people. On those days, I try to grab something to eat at a favorite diner or other eatery.
Life is about making yourself happy no matter what your circumstances. If your health is failing you, then you know your time is limited. You then have to look at your life as a whole story you might read in a book. And that you're living the final chapters. You saw other people grow old and die knowing it would be your fate as well one day. Knowing this should just convince you even more strongly that life has always been about what you make of it.
The greatest thing about your later years is that your time is your own to enjoy in whatever way you wish. If age slows you down, just feel privileged to experience what loved ones before you went through. You're walking in their shoes just like you have been your entire life.