The growth of this population contributed to an increase in the national median age from 37.2 years in 2010 to 38.4 in 2019, according to the Census Bureau's 2019 Population Estimates. ... “Since then, there's been a rapid increase in the size of the 65-and-older population, which grew by over a third since 2010.
As per the 2019 Demographic Projections of the U.s. Census, the rise of this population resulted in an increase throughout the regional average age. "In 2011, the very first Younger Generations reached 65 years of age."