I’m not sure if I should dignify this with the response, but part of caring for old people is having enough young people to do it.
We do this all the time, including with debt, pensions, etc. Once born, the currently unborn have the choice to take care of their parents or not, to decide en masse not to become a doctor or nurse, to emigrate to a different country without a pension system (or to just be jobless forever to avoid paying for that)...