Population decline is an economic issue not an ecological one. How do we support a larger population of non-working elderly with an ever decreasing population o

Population decline is an economic issue not an ecological one. How do we support a larger population of non-working elderly with an ever decreasing population of workers. I don't see how without a restructuring of our economy and society which doesn't seem to be on the table. South Korea is essentially already doomed. In 25 years over half their population will be over 65. It's workforce will be half what it is now. It simply will not be able to care for the elderly. They will work until they die in poverty. Ideally as society advances and productivity increases the necessary ratio of workers to non-workers should decrease as well but, the gains of productivity increases have historically not translated to wealth of the populace. And even if productivity does shift to benefit the worker it has to outpace population implosion which seems impossible considering the compounding nature of the decline.