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Population - Adults Ages 18-64
Population - Adults Ages 18-64 in United States
United States

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Percentage of population ages 18-64

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Population - Adults Ages 18-64 by State

Percentage of population ages 18-64

Population - Adults Ages 18-64 Trends

Percentage of population ages 18-64

Trend: Population - Adults Ages 18-64 in United States, 2023 Annual Report

Percentage of population ages 18-64

United States

 CDC WONDER, Single-Race Population Estimates

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About Population - Adults Ages 18-64

US Value: 60.9%

Top State(s): Colorado: 63.5%

Bottom State(s): South Dakota: 57.9%

Definition: Percentage of population ages 18-64

Data Source and Years: CDC WONDER, Single-Race Population Estimates, 2022

Suggested Citation: America's Health Rankings analysis of CDC WONDER, Single-Race Population Estimates, United Health Foundation,, accessed 2023.

The demographics of a state influence the health needs and outcomes of the population. Understanding its demographic breakdown can help state health officials determine priorities for health promotion and disease prevention. People between the ages of 18 and 64 account for approximately 79% of the adult population of the United States. This population is commonly referred to as working-age adults, as most in this age range are part of the workforce. This population is often used as an economic measure to indicate the total number of workers available in an economy.

Many working-age adults have chronic health conditions. About a quarter of adults ages 18-44 have one or more chronic conditions and nearly two-thirds of adults ages 45-64 have one or more. The most expensive health conditions for this age group are cancer, heart conditions, arthritis, other non-traumatic joint disorders, trauma-related disorders and mental disorders.

Boersma, Peter, Lindsey I. Black, and Brian W. Ward. “Prevalence of Multiple Chronic Conditions Among US Adults, 2018.” Preventing Chronic Disease 17 (September 17, 2020): 200130.

Mather, Mark, Linda A. Jacobsen, Beth Jarosz, Lillian Kilduff, Amanda Lee, Kelvin M. Pollard, Paola Scommegna, and Alicia Vanorman. “America’s Changing Population: What to Expect in the 2020 Census.” Population Bulletin 74, no. 1 (2019).

Soni, Anita. “Top Five Most Costly Conditions among Adults Age 18 and Older, 2012: Estimates for the U.S. Civilian Noninstitutionalized Population.” Statistical Brief #471. Rockville, MD: Agency for Healthcare Research and Quality, April 2015.

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America’s Health Rankings builds on the work of the United Health Foundation to draw attention to public health and better understand the health of various populations. Our platform provides relevant information that policymakers, public health officials, advocates and leaders can use to effect change in their communities.

We have developed detailed analyses on the health of key populations in the country, including women and children, seniors and those who have served in the U.S. Armed Forces, in addition to a deep dive into health disparities across the country.