So apparently the projections are that Africa will still be in lots of trouble in 2100, considering that they'll only have perhaps 10 or 20 elderly persons per 100 workers. Those things can be self-fulfilling prophecies.

On the other hand, elites are probably working right now on drastically bringing down that number in wealthier nations.

Interesting too are the different rates of full retirement between men and women in different countries. In Europe, Russia, Autralia and Canada, not even 20% of men or women over 65 are working, but in the U.S., Japan and a couple of European nations, at least 20% of the men are.