This is a list of U.S. states, the District of Columbia and territories by median age in 2020. The median age is the index that divides the entire population into two numerically equal age groups, one younger than that age and the other older than that age. It is the only index associated with the age distribution of a population. See also Demography of the United States List of countries by median age Notes References median age United States demography-related lists United States, median age