As of 2010, about 17% of Washington, D.C. residents were age 18 or younger, which is lower than the U.S. average of 24%. However, at 34 years old, the... by @wikipedia

As of 2010, about 17% of Washington, D.C. residents were age 18 or younger, which is lower than the U.S. average of 24%. However, at 34 years old, the district had the lowest median age compared to the 50 states as of 2010. , there were an estimated 81,734 immigrants living in Washington, D.C. Major sources of immigration include El Salvador, Ethiopia, Mexico, Guatemala, and China, with a concentration of Salvadorans in the Mount Pleasant neighborhood.