Retirement for all was an artifact of rapidly growing populations and shorter life spans. Back 50-100 years ago you had each young person supporting maybe 0.1 to 0.25 retired people, and a retirement age in the 60s meant you’d get a few years before now easily treatable heart conditions would kill you. (Everyone smoked too, which “helped” clear the retirement rolls.)
In a world with even a stable population (let alone a declining one) retirement isn’t viable. Or at the very least the age will be raised a lot. I could see 80 as a retirement age in 2050.
Honestly an institutionalized retirement age in the 60s today is unfair and exploitative toward young people. It’s generational economic cannibalism, stopping young people from establishing themselves to fund the old.
More simple , it's not sustainable because new workers dont earn much, people live longer and % from the state budget just keeps growing.
Think of it as income growth getting slower and liabilities growing just bigger with more old people in terms of %. how can you or we fix that?
This is an idealogical argument more than a factual one. It certainly appears to be sustainable.
Step back from the gdp/debt ratio figures though. The argument is really only about whether a decreasing workforce can support an increasing population of retirees.
If government pays retirees then retirees get a direct payout, and use it to buy goods and services that younger people provide.
If (like in Australia) we make everyone invest through their life then each has a well-funded retirement account largely tied up in the stock-market. This represents part ownership of assets in the productive economy, which can be converted to funds that retired people will use ... to buy goods and services that younger people provide.
Where the money comes from seems less important to me than the fact if there is an ever increasing population of retirees, then one way or another they are supported by working people.
The mechanism is just an abstraction. The demographic problem is probably more real.