I’m afraid I can’t claim much expertise in the ‘coming financial disaster’ you allude to — presumably in the United States. My article is mainly about the economics of the situation, not the financial aspects. Economics is about how we decide to use our real resources — raw material, manpower, etc. And from a real resources point of view, we don’t need people to be working into their old age.
There will be issues about how we should arrange our finances in order that people don’t need to work into old age — but the fundamental economics of the situation easily allow for a reasonable retirement age for everyone — rich or poor.