The study also predicts major changes in the global age structure as fertility falls and life expectancy increases, with an estimated 2.37 billion people over 65 years globally in 2100, compared with 1.7 billion under the age of 20.
这项研究还预测,随着生育率下降和寿命延长,全球年龄结构将发生重大变化,2100年全球65岁以上人口估计将达到23.7亿,而20岁以下人口只有17亿。
The global number of people older than 80 could increase sixfold, from 141 million to 866 million. Meanwhile, the number of children under the age of five is forecast to decline by more than 40% -- from 681 million in 2017 to 401 million in 2100.
全球80岁以上人口将增加5倍,从1.41亿增至8.66亿。与此同时,5岁以下婴童数量预计将减少40%以上——从2017年的6.81亿减少到2100年的4.01亿。
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