The U.S. population has gotten older in the past two decades, with adults 65 or older growing by more than a third from 2010 to 2020, while the share of children under the age of 5 declined, according to Census Bureau data released May 25.
From 2000 to 2020, baby boomers (born 1946–1964) and millennials (born 1982–2000) continued to age, and at the same time from 2010 to 2020, smaller cohorts of children were born, according to data from the 2020 Census Demographic and Housing Characteristics.
Combined, the trends mean the median age in the United States jumped from 37.2 to 38.8 over the decade. By state, Maine had the oldest median age, 45.1, in 2020, and Utah had the youngest, 31.3….