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January 2, 2026 Article/Editing: Graphics/Design:

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U.S. Population by Generation

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Key Takeaways

Millennials are the largest generation in the U.S., accounting for more than one in five Americans.

Boomers and Gen X together still make up nearly 40% of the population, reflecting the country’s aging demographic profile.

The age structure of the U.S. population is undergoing a major transition, as younger generations are becoming more prominent.

This visualization breaks down the U.S. population by generation in 2025, using data from the U.S. Census Bureau, as of 2025.

Millennials and Gen Z Are the Two Largest

Millennials, born between 1981 and 1996, are the largest generation in the U.S., with roughly 74 million people. They account for 22% of the total population and are now firmly in their prime working and family-forming years. Close behind is Generation Z, with over 71 million people, representing 21% of Americans.

GenerationBirth YearsAge Range (2025)PopulationShare of population

Silent Generation	1928–1945	80–97	13,741,630	4%
Baby Boomers	1946–1964	61–79	64,448,248	19%
Generation X	1965–1980	45–60	65,432,121	19%
Millennials	1981–1996	29–44	74,104,186	22%
Generation Z	1997–2012	13–28	71,146,116	21%
Generation Alpha	2013–2025	0–12	51,238,687	15%
Total Population	-	-	340,110,988	100%

Boomers and Gen X are a Major Demographical Force

Baby Boomers remain a major demographic force, totaling about 64 million people, or 19% of the population. Now aged 61 to 79, this group continues to impact healthcare demand, retirement systems, and wealth distribution. Generation X is nearly the same size, with 65 million people and an equal 19% share.

Meanwhile, generation Alpha, born from 2013 onward, already numbers more than 51 million people. Although they represent 15% of the population, their impact is still emerging. This cohort will shape future education systems, technology adoption, and long-term workforce trends.

At the opposite end of the spectrum, the Silent Generation now makes up just 4% of Americans.

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