Here are the youngest and oldest counties in the US

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The median age of residents in US counties and county equivalents ranges from just 22.4 years in Lexington City, Virginia, to 66.6 in Sumter County, Florida.

The US Census Bureau recently released data on the age breakdown of the US population. Among the various pieces of information were estimates for the median age of the residents in each of the 3,142 counties and county equivalents across the country.

Although there is a lot of variation in age within each state, there are a few interesting trends. Far northern counties in Maine, Michigan, and Wisconsin tend to have older populations, as do popular retirement destinations in Florida. Meanwhile, counties in the Southwest and in oil-rich areas in North Dakota and Texas have some of the lowest median ages in the country.

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10. Richmond, California

Population: 107,341
Violent Crime Rate: 1,036 per 100,000
Murder Rate: 15 per 100,000 people
Population Below Poverty Line: 17.9%
Last Year's Rank: 7

(Photo: Greg Pease via Getty)

9. Beaumont, Texas

Population: 118,177
Violent Crime Rate: 1,037 per 100,000 people
Murder Rate: 14 per 100,000 people
Population Below Poverty Line: 22.3%
Last Year's Rank: 11

(Photo: Anne Rippy via Getty)

8. Lansing, Michigan

Population: 113,907
Violent Crime Rate: 1,057 per 100,000 people
Murder Rate: 7 per 100,000 people
Population Below Poverty Line: 16.3%
Last Year's Rank: 21

(Photo: David Olds via Getty)

7. Paterson, New Jersey

Population: 145,082
Violent Crime Rate: 1,072 per 100,000 people
Murder Rate: 12 per 100,000 people
Population Below Poverty Line: 27.6%
Last Year's Rank: Not in top 10

(Photo: Mel Evans, AP)

6. Springfield, Massachusetts

Population: 153,586
Violent Crime Rate: 1,089 per 100,000 people
Murder Rate: 14 per 100,000 people
Population Below Poverty Line: 28.7%
Last Year's Rank: 10

(Photo: Barry Winiker via Getty)

5. Springfield, Missouri

Population: 163,062
Violent Crime Rate: 1,162 per 100,000 people
Murder Rate: 7 per 100,000 people
Population Below Poverty Line: 24.0%
Last Year's Rank: 14

(Photo: Alan Copson via Getty)

4. Hartford, Connecticut

Population: 124,927
Violent Crime Rate: 1,179 per 100,000 people
Murder Rate: 18 per 100,000
Population Below Poverty Line: 33.9%
Last Year's Rank: 4

(Photo: Paul Souders via Getty)

3. New Haven, Connecticut

Population: 131,071
Violent Crime Rate: 1,254 per 100,000 people
Murder Rate: 14 per 100,000 people
Population Below Poverty Line: 26.9%
Last Year's Rank: 2

(Photo: Jessica Hill via AP)

2. Rockford, Illinois

Population: 150,209
Violent Crime Rate: 1,375 per 100,000 people
Murder Rate: 13 per 100,000 people
Population Below Poverty Line: 25.1%
Last Year's Rank: 3

(Photo: Earl Wilkerson via Getty)

1. Little Rock, Arkansas

Population: 197,399
Violent Crime Rate: 1,407 per 100,00 people
Murder Rate: 18 per 100,000 people
Population Below Poverty Line: 18.2%
Last Year's Rank: 5

(Photo via Getty)

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Here's a map illustrating the estimated median age of residents in each of those counties as of July 1, 2015. Lighter counties are younger, and darker counties are older:

county median age residentsBusiness Insider/Andy Kiersz, data from US Census Bureau

And here are the 15 counties with the youngest and oldest residents, along with their median ages:

oldest and youngest counties residentsBusiness Insider/Andy Kiersz, data from US Census Bureau

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