21. Massachusetts: Suffolk County
> Median age: 32.6 years (county), 39.4 years (state)
> Pop. under 18: 17.0% (county), 20.4% (state)
> Population: 780,685
> Life expectancy: 79.9 years
> County seat: Boston
22. Michigan: Isabella County
> Median age: 27.4 years (county), 39.6 years (state)
> Pop. under 18: 17.4% (county), 22.3% (state)
> Population: 70,572
> Life expectancy: 79.1 years
> County seat: Mount Pleasant
23. Minnesota: Blue Earth County
> Median age: 30.6 years (county), 37.9 years (state)
> Pop. under 18: 19.7% (county), 23.4% (state)
> Population: 65,767
> Life expectancy: 81.0 years
> County seat: Mankato
24. Mississippi: Oktibbeha County
> Median age: 25.4 years (county), 36.9 years (state)
> Pop. under 18: 17.5% (county), 24.3% (state)
> Population: 49,392
> Life expectancy: 77.9 years
> County seat: Starkville
25. Missouri: Adair County
> Median age: 27.3 years (county), 38.4 years (state)
> Pop. under 18: 18.0% (county), 22.9% (state)
> Population: 25,437
> Life expectancy: 78.0 years
> County seat: Kirksville
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