It does not really make a big difference if the pensioner saved 100k while working and put it in their couch, or if they payed it in ekstra taxes which got saved by the government, or if the government presses new money.
The important part is how large fraction of the population work, not where the money for the remaining fraction comes from. Money is only a representation of value, value created by the working fraction.
True, but that is at a different level and a bit more complex. I was talking about the problem of government finances - i.e. government revenue vs expenditure.
Setting aside money, and where you put it, makes a big difference. It might be in a sovereign wealth fund, or used to finance govt debt (as in the small fund that exists in the UK) or invested in shares by a private pension fund, or be a liability of a past employer. In some of those cases value might be generated in another country.
You are right in principle but there are big practical differences too.
The important part is how large fraction of the population work, not where the money for the remaining fraction comes from. Money is only a representation of value, value created by the working fraction.