the state with the lowest percentage of the population under age 18 — 18.5%

Source: U.S. Census Bureau
Additional Information: In contrast, Utah has the highest portion of the population under 18 years of age: 30 percent. Nationwide, the figure is 22 percent.
Reference: For more information, read the U.S. Census Bureau analysis, "QuickFacts." "QuickFacts."

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