Aging U.S. Population

There will soon, within a few decades, be an important demographic turning point in U.S. history. By 2035, there will be 78.0 million people 65 years and older compared to 76.4 million under the age of 18, according to the U.S. Census Bureau’s 2017 National Population Projections.

By 2030, all baby boomers will be older than age 65. This will mean that 1 in every 5 residents will be retirement age.

“The aging of baby boomers means that within just a couple decades, older people are projected to outnumber children for the first time in U.S. history,” said Jonathan Vespa, a demographer with the U.S. Census Bureau.

The 2030s are projected to be a transformative decade for the U.S. population on several measures. The population is expected to grow at a slower pace, age considerably and become more racially and ethnically diverse.

Net international migration is projected to overtake natural increase in 2030 as the primary driver of population growth in the United States, another demographic first for the country. Although births are projected to be nearly four times larger than the level of net international migration in coming decades, a rising number of deaths will increasingly offset how much births are able to contribute to population growth. Between 2020 and 2050, the number of deaths is projected to rise substantially as the population ages and a significant share of the population, the baby boomers, age into older adulthood. As a result, the population will naturally grow very slowly, leaving net international migration to overtake natural increase as the leading cause of population growth, even as projected levels of migration remain relatively constant.

By 2060, the United States is projected to grow by 78 million people, from about 326 million today to 404 million. The population is projected to cross the 400-million threshold in 2058.

In coming years, the rate at which the U.S. population grows is expected to slow down. The population is projected to grow by an average of 2.3 million people per year until 2030. But that number is expected to decline to an average of 1.8 million per year between 2030 and 2040, and continue falling to 1.5 million per year from 2040 to 2060.

As the population ages, the ratio of older adults to working-age adults is projected to rise. By 2020, there will be about three-and-a-half working-age adults for every retirement-age person. By 2060, that ratio will fall to just two-and-a-half working-age adults for every retirement-age person.