The solution to this issue is good governance, which translates to good economies and better social and welfare systems, but that’s kinda a pipe dream for African nations at this point.
While I am not suggesting eliminating financial/logistic independence between generations within a family, but it is an interesting side effect.
Edit: to respond to vkou’s comment below, I don’t see any empirical evidence for this to be true. For one, the work involved in supporting old, disabled people is highly undesirable (meaning high prices for labor). And second, I do not see automation advancing quickly enough to change all those bedpans.
Also, the more resources a country spends on healthcare and defined benefit pensions (far and away the most expensive part of caring for old people), the less resources a country has to spend on other stuff (that benefits younger people).
This is evident in the fact that nursing facilities cost $10k to $20k per month for round the clock care, and the common adage is you don’t want to be stuck in a $10k per month facility.
There is, of course, truth to some of the productivity surplus being eaten by rentiers, but from what I can tell, nowhere near enough to make up for the economic boost that fertility rates of 4+ give.
The demographic implosion narrative is just a nativist distraction from the investment class eating all the productive surplus.
We would need radical changes to our expectations or to the efficiency of our governments