These discussions about the tax burden of seniors are about two things in the end: health care and assisted living.
Assisted living means: workers to cook meals for seniors, to help them dress, to remind them to take their pills, etc. In our advanced industrialized societies, we offload that burden to young workers in their prime. In more traditional societies like Japan, senior communities don’t need young workers because they rely on one another. Let seniors cook for one another, help one another get dressed, etc. And let young workers go start businesses or work on cancer cures or build software and help society get richer as a whole.
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There’s still the health care aspect to deal with (seniors can’t do heart surgery on one another), but we could decrease the tax burden of over 65s by switching to a Japanese model.