In the 2020s, birth rates are no longer simply dropping; they have been so low for so long that even the countries with the younger age structures are now running low of young adults—the demographic that produces the children. As the already smaller twenty-something and thirty-something cadres age into their thirties and forties, birth rates will not simply continue their long decline, they will collapse. And once a country has more older folks than children, the next, horrible step is utterly unavoidable: a population crash. And because any country that begins this process is one that has
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