Number of adults aged 20 to 64

In 2026, the number of adults aged 20 to 64 will inch up to an estimated 195.1 million, representing only a marginal 0.1% increase over the prior year and underscoring continued stagnation in the working-age population. The main drag comes from the powerful demographic push of baby boomers into the 65-and-older bracket, which is expanding much faster than the 20-64 cohort and steadily raising the average age of the US population. Federal enforcement efforts and policy changes aimed at undocumented immigrants and humanitarian status holders since 2025 have further reduced the pool of foreign-born workers in these ages, limiting migration-driven gains just as employers remain hungry for labor. As a result, 2026 marks another year in which tight labor markets coexist with only minimal growth in the underlying population of adults in their prime economic years.

Over the five years through 2026, the number of adults aged 20 to 64 edged up only slightly, from roughly 194.0 million in 2021 to 195.1 million, translating into a compound annual growth rate of just 0.12%. Early in the period, gains were essentially wiped out by the pandemic-era baby bust and a longer-term slide in fertility, which left thinner cohorts aging into their twenties and thirties and limited natural increases in the working-age group. At the same time, baby boomers continued to cross the 65-year threshold in large numbers, shrinking the share of the population in the 20-64 band and pushing a larger proportion into retirement or partial retirement. Even as labor force participation among prime-age adults recovered from its pandemic lows, the underlying headcount of people in this age bracket barely changed, forcing a greater reliance on older workers and productivity gains rather than sheer population growth to meet labor demand.

Immigration trends over 2021-2026 reinforced this demographic squeeze and prevented a stronger expansion of adults aged 20 to 64. After the pandemic-related collapse in inflows, net migration never fully returned to prior peaks, and a growing share of new arrivals fell outside traditional employment pathways. Policy shifts beginning in 2025, including tighter enforcement against undocumented immigrants and rollbacks or expirations of temporary protections, removed foreign-born workers from the labor force just as domestic growth in the 20-64 population was flattening out. Because most immigrants arrive in their prime working years, this retreat in migration flows directly curbed the growth of the adult 20-64 population and cemented a five-year pattern of near-stagnation in the core working-age cohort.