Census

WASHINGTON D.C.–The 2020 Census showed that the adult (age 18 and older) population group grew 10.1% to 258.3 million people over the decade.

"More than three-quarters, 77.9%, of the U.S. population were age 18 and over," said Andrew Roberts, chief of the Sex and Age Statistics Branch in the Census Bureau's Population Division. "The adult population grew faster than the nation as a whole. By compa...