As an example of population demographics, an Asian site reports that Japan wants to immigrate up to 10,000 potential eldercare workers in the next three years because of its exploding elderly population, with low birthrate, link here.
Of course, this would raise the question of whether more retired people in the US should consider this. There have been positions called “senior home companion”, minimum age 60, with a small stipend payment, in some states, but it may require more socialiability than a lot of retirees (me) have.
One way to stay out of medical trouble is to keep your momentum. Keep getting everything done. Doctor’s appointments get in the way. Time eventually will run out, and it will be "pencils down".