The U.S. median age has steadily increased over the past several decades. While the typical American was only 29.5 years old in 1960, the median age has risen to 37.6 years old by 2015. Much of this increase is due to improving life expectancy and the baby boomer generation reaching retirement age.

While the country is aging on the whole, at a local level, some areas have significantly older populations than others. 24/7 Wall St. reviewed the median age in all U.S. counties to identify the county in every state with the oldest residents. Sumter County, Florida has the highest median age of any U.S. county. The typical Sumter resident is 65.3 years old.

Click here to see the oldest county in every state.

Generally, counties located in northeastern states tend to have older populations than those in southern or western states. Also, states with older populations tend to have less variation in age between counties. In Maine, for example, the median age is 43.8 years old, the highest of any state. The difference between Maine’s oldest county and its youngest county is only 10.2 years. In Virginia, a state where the typical resident is 6.2 years younger than the typical Maine resident, the county with the oldest population has a median age nearly 37.6 years higher than the state’s youngest county. This is the largest age gap of any state.

The aging baby boomer generation, which began turning 65 in 2011, is a large driver behind the increasing median age, and is a major factor in the oldest counties in each state. In 2015, 14.1% of Americans were 65 years or older. In Sumter County, Florida, more than half of the residents are 65 and older.

To determine the oldest county in every state, 24/7 Wall St. reviewed the median age for all U.S. counties from the U.S. Census Bureau’s 2015 American Community Survey. The share of residents 65 and older and the average retirement income were also from the ACS. The average retirement income was calculated from the aggregate retirement income received in the last 12 months and the number of households receiving retirement income in a given county.

This is the oldest county in every state.

1. Cherokee County, Alabama
> Median age: 45.4
> State median age: 38.4
> Population 65+: 19.8%
> Avg. retirement income: $17,689

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2. Wrangell City and Borough, Alaska
> Median age: 50.4
> State median age: 33.4
> Population 65+: 21.6%
> Avg. retirement income: $21,472

3. La Paz County, Arizona
> Median age: 54.8
> State median age: 36.8
> Population 65+: 35.2%
> Avg. retirement income: $21,292

4. Baxter County, Arkansas
> Median age: 51.5
> State median age: 37.7
> Population 65+: 29.6%
> Avg. retirement income: $21,510

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5. Sierra County, California
> Median age: 54.5
> State median age: 35.8
> Population 65+: 24.4%
> Avg. retirement income: $31,008

6. Mineral County, Colorado
> Median age: 60.9
> State median age: 36.3
> Population 65+: 36.6%
> Avg. retirement income: $34,118

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7. Litchfield County, Connecticut
> Median age: 46.0
> State median age: 40.4
> Population 65+: 17.7%
> Avg. retirement income: $25,879

8. Sussex County, Delaware
> Median age: 47.0
> State median age: 39.3
> Population 65+: 23.3%
> Avg. retirement income: $27,799

9. Sumter County, Florida
> Median age: 65.3
> State median age: 41.4
> Population 65+: 50.9%
> Avg. retirement income: $31,364

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10. Union County, Georgia
> Median age: 53.3
> State median age: 35.9
> Population 65+: 30.4%
> Avg. retirement income: $25,441

11. Kalawao County, Hawaii
> Median age: 51.9
> State median age: 38.0
> Population 65+: 24.7%
> Avg. retirement income: $17,607

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12. Boise County, Idaho
> Median age: 52.0
> State median age: 35.5
> Population 65+: 20.7%
> Avg. retirement income: $27,118

13. Henderson County, Illinois
> Median age: 49.1
> State median age: 37.3
> Population 65+: 22.9%
> Avg. retirement income: $16,992

14. Brown County, Indiana
> Median age: 48.3
> State median age: 37.3
> Population 65+: 20.2%
> Avg. retirement income: $19,649

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15. Dickinson County, Iowa
> Median age: 48.7
> State median age: 38.1
> Population 65+: 23.6%
> Avg. retirement income: $22,043

16. Decatur County, Kansas
> Median age: 52.3
> State median age: 36.0
> Population 65+: 27.4%
> Avg. retirement income: $30,309

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17. Lyon County, Kentucky
> Median age: 49.0
> State median age: 38.5
> Population 65+: 22.4%
> Avg. retirement income: $26,147

18. Tensas Parish, Louisiana
> Median age: 43.0
> State median age: 36.1
> Population 65+: 19.3%
> Avg. retirement income: $21,174

19. Lincoln County, Maine
> Median age: 49.8
> State median age: 43.8
> Population 65+: 24.3%
> Avg. retirement income: $26,373

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20. Worcester County, Maryland
> Median age: 49.1
> State median age: 38.2
> Population 65+: 24.7%
> Avg. retirement income: $31,147

21. Barnstable County, Massachusetts
> Median age: 51.3
> State median age: 39.3
> Population 65+: 27.1%
> Avg. retirement income: $31,723

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22. Alcona County, Michigan
> Median age: 56.6
> State median age: 39.5
> Population 65+: 33.9%
> Avg. retirement income: $21,630

23. Aitkin County, Minnesota
> Median age: 53.1
> State median age: 37.7
> Population 65+: 29.2%
> Avg. retirement income: $22,883

24. Amite County, Mississippi
> Median age: 45.3
> State median age: 36.5
> Population 65+: 20.2%
> Avg. retirement income: $19,416

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25. Hickory County, Missouri
> Median age: 53.5
> State median age: 38.2
> Population 65+: 31.5%
> Avg. retirement income: $17,420

26. Granite County, Montana
> Median age: 53.7
> State median age: 39.7
> Population 65+: 28.3%
> Avg. retirement income: $22,828

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27. Hooker County, Nebraska
> Median age: 57.9
> State median age: 36.2
> Population 65+: 35.8%
> Avg. retirement income: $12,678

28. Storey County, Nevada
> Median age: 54.7
> State median age: 37.2
> Population 65+: 26.3%
> Avg. retirement income: $23,245

29. Carroll County, New Hampshire
> Median age: 50.3
> State median age: 42.2
> Population 65+: 23.4%
> Avg. retirement income: $28,382

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30. Cape May County, New Jersey
> Median age: 48.3
> State median age: 39.4
> Population 65+: 23.3%
> Avg. retirement income: $27,453

31. Catron County, New Mexico
> Median age: 57.1
> State median age: 37.0
> Population 65+: 32.7%
> Avg. retirement income: $29,196

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32. Hamilton County, New York
> Median age: 51.9
> State median age: 38.1
> Population 65+: 25.8%
> Avg. retirement income: $25,441

33. Polk County, North Carolina
> Median age: 50.9
> State median age: 38.0
> Population 65+: 26.9%
> Avg. retirement income: $25,390

34. Grant County, North Dakota
> Median age: 53.6
> State median age: 35.4
> Population 65+: 27.7%
> Avg. retirement income: $21,573

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35. Noble County, Ohio
> Median age: 50.2
> State median age: 39.2
> Population 65+: 22.3%
> Avg. retirement income: $21,250

36. McIntosh County, Oklahoma
> Median age: 47.4
> State median age: 36.2
> Population 65+: 24.1%
> Avg. retirement income: $18,533

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37. Wheeler County, Oregon
> Median age: 56.5
> State median age: 39.1
> Population 65+: 34.3%
> Avg. retirement income: $21,739

38. Sullivan County, Pennsylvania
> Median age: 51.8
> State median age: 40.5
> Population 65+: 26.5%
> Avg. retirement income: $16,929

39. Bristol County, Rhode Island
> Median age: 43.9
> State median age: 39.7
> Population 65+: 18.4%
> Avg. retirement income: $25,763

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40. McCormick County, South Carolina
> Median age: 51.9
> State median age: 38.6
> Population 65+: 29.2%
> Avg. retirement income: $27,705

41. Custer County, South Dakota
> Median age: 52.8
> State median age: 36.8
> Population 65+: 24.8%
> Avg. retirement income: $17,932

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42. Cumberland County, Tennessee
> Median age: 49.7
> State median age: 38.4
> Population 65+: 28.4%
> Avg. retirement income: $24,442

43. Llano County, Texas
> Median age: 56.3
> State median age: 34.1
> Population 65+: 33.6%
> Avg. retirement income: $25,806

44. Kane County, Utah
> Median age: 43.6
> State median age: 30.1
> Population 65+: 20.6%
> Avg. retirement income: $35,000

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45. Essex County, Vermont
> Median age: 48.8
> State median age: 42.4
> Population 65+: 22.0%
> Avg. retirement income: $15,980

46. Highland County, Virginia
> Median age: 59.0
> State median age: 37.6
> Population 65+: 34.0%
> Avg. retirement income: $22,287

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47. Jefferson County, Washington
> Median age: 55.6
> State median age: 37.4
> Population 65+: 30.1%
> Avg. retirement income: $28,417

48. Pendleton County, West Virginia
> Median age: 49.1
> State median age: 41.8
> Population 65+: 24.0%
> Avg. retirement income: $17,645

49. Vilas County, Wisconsin
> Median age: 52.6
> State median age: 39.0
> Population 65+: 28.2%
> Avg. retirement income: $25,187

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50. Hot Springs County, Wyoming
> Median age: 49.6
> State median age: 36.8
> Population 65+: 22.4%
> Avg. retirement income: $22,016

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