聊天,
The Brookings study found that people under age 40 made up 50.7 percent of the U.S. population as of July 2019. The percentage represented 代表 166 million people.
布鲁金斯学会的研究发现,截至2019年7月,40岁以下人口占美国人口的50.7%。这一百分比代表1.66亿人。
Older age groups numbered总计 162 million people.
老年人口为1.62亿。