https://www.nytimes.com/2023/06/22/us/census-median-age.html
New census data shows that the country’s median age is now over 38. In 1980, it was 30.
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Original link from The New York Times
Never mind it being too expensive to have kids, it’s too expensive to exist. Population aging is just an obvious consequence of that.
Putting my nerd hat on, I could see there being some sort of equilibrium on a large enough timeline that we vacillate between above and below, populationwise. Population itself becomes the overarching economic cycle as we swing between periods of rampant capitalism and whatever replaces it. It does not appear we would learn the first time.
This is, of course, all assuming we don't roast or blow ourselves up first.
One of the big reasons why the economy and healthcare system are on the verge of catastrophic collapse
The main reason being the massive concentration of wealth at the top, not since since just before the last catastrophic economic collapse.