Which phrases best summarize the US population in the twenty-first century?

The U.S. population has been getting older as life expectancy rises and the large baby-boom generation ages. It has also become more culturally diverse, with growing racial and ethnic diversity. Income inequality has widened, creating a bigger gap between higher- and lower-income groups. Thus, “older, more culturally diverse, a bigger income gap between classes” is the best summary.

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