<P> There were about 125.9 million adult women in the United States in 2014 . The number of men was 119.4 million . At age 85 and older , there were almost twice as many women as men ( 4 million vs. 2.1 million ) . People under 21 years of age made up over a quarter of the U.S. population ( 27.1 % ) , and people age 65 and over made up one - seventh ( 14.5 % ) . The national median age was 37.8 years in 2015 . </P>
<P> There were about 125.9 million adult women in the United States in 2014 . The number of men was 119.4 million . At age 85 and older , there were almost twice as many women as men ( 4 million vs. 2.1 million ) . People under 21 years of age made up over a quarter of the U.S. population ( 27.1 % ) , and people age 65 and over made up one - seventh ( 14.5 % ) . The national median age was 37.8 years in 2015 . </P>
what is the average age of the united states population
what is the average age of the united states population
37.8 years
37.8 years