Much is said about the ethnic patchwork of the United States, but this map highlights another kind of diversity: age. FRED’s county-level data on the age distribution of the U.S. population show large variations across the country and also within states. The spread of the range is also surprising. The youngest median age, 21.4 years, is in Lexington City County, Virginia—a small county that hosts two universities. The oldest median age, 65.3 years, is in Sumter County, Florida, where over half the residents live in a giant retirement community. Florida is expected to have a high median age, but other states also have counties with high median ages, including the admittedly small counties of Mineral, Colorado (60.9 years); Highland, Virginia (59.0 years); and Hooker, Nebraska (57.9 years).
How this map was created: Go to GeoFRED, select county-level data, and find median age population data in the drop-down menu.
Suggested by Christian Zimmermann.