Oklahoma: Payne County
> Median age: 27.3 years (state: 36.6 years)
> Population under 18: 19.1% (state: 24.3%)
> Population 65 and over: 12.3% (state: 15.3%)
> Total population: 81,815
> Largest place in county: Stillwater
Source: Flutter_97321 / Getty Images
Oregon: Benton County
> Median age: 33.0 years (state: 39.3 years)
> Population under 18: 16.4% (state: 21.0%)
> Population 65 and over: 15.5% (state: 17.2%)
> Total population: 91,107
> Largest place in county: Corvallis
24/7 Wall St.
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Pennsylvania: Centre County
> Median age: 32.3 years (state: 40.8 years)
> Population under 18: 15.0% (state: 20.8%)
> Population 65 and over: 13.8% (state: 17.8%)
> Total population: 161,960
> Largest place in county: State College
Source: DenisTangneyJr / iStock via Getty Images
Rhode Island: Providence County
> Median age: 37.4 years (state: 39.9 years)
> Population under 18: 20.7% (state: 19.6%)
> Population 65 and over: 15.0% (state: 16.8%)
> Total population: 635,737
> Largest place in county: Providence
Source: J. Michael Jones / iStock Editorial via Getty Images
South Carolina: Richland County
> Median age: 33.4 years (state: 39.4 years)
> Population under 18: 21.5% (state: 22.0%)
> Population 65 and over: 12.3% (state: 17.2%)
> Total population: 411,357
> Largest place in county: Columbia
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