Nation Golden oldies? Number of seniors surged in 2020 census data, lifting the median age in US May 25, 2023 Marc Ramirez, USA TODAY Comments Off on Golden oldies? Number of seniors surged in 2020 census data, lifting the median age in US 2020 U.S. Census data shows a 9% drop in kids under five as the number of adults 65 and older swelled, lifting Americans' median age to nearly 39.