If you're that old and still working, then ask your employer to require others to wear masks. Avoid being in public whenever possible otherwise.
Heck, there are food delivery services that will ship fresh ingredients to your house if you're so inclined. Between that and Amazon I bet you could live at home for a year on end (work and outdoor activity excepted).
Personally I'd go stir-crazy, but it's a valid option if you're afraid of COVID after being vaccinated.