In a society where there are plenty of other well-paying jobs to be had, working at a nursing home won't be the popular choice. I expect the future to be interesting.
Personally, I'm preparing for a future where a nursing home isn't an option. Just in case.
It's common to equate old age with nursing homes and misery in the West.
Other cultures show that this needn't be the case at all and is - for the most part; there's still about 30% genetics involved - dependent on how you chose to spend your days. Less Netflix, Facebook, and convenience food, more exercise and healthy, non-processed food can get you much further than a billion dollars and medical personnel...
The health of that 80 year old is only relavent in terms of the amount of resources needed to move from the working class to the non-working class. The healther the aged, the fewer the resources. The higher the working:retired ratio, the fewer the resources.
What is to stop the adults under say 50 who have barely any capital at all (401ks, houses, shares, whatever) from saying "screw this, I'm off to $other_country where I don't live hand to mouth and have no future of retirement"
A country can not survive when 90% of its population are 80 years old, no matter how healthy or rich those people are, it means for every 10 hours an under-80 works, 9 hours is to produce goods and services for other people.
Now if the whole world was 90% elderly you might have a point.