It __can__ support the final balance __after__ the population has declined to the point that it will stay at.
What is __harder__ to do is to support it __while__ the decline is happening because during that time you have way more older, non-working people that need all the things a society produces (food, medicine, housing, power, personal care etc) but proportionally fewer working age people producing and doing those things.
So during the decline you either have to have old people going without, or working people have to work extra and get no benefit themselves. Not fair to anyone because those “old” people in that scenario are us right now who are working and contributing in taxes etc that are supporting the previous generations (the boomers right now).
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