United States Generation Breakdown 2026: How Many Millennials, Gen Z, and Boomers?

Q: What is the largest generation in the United States?

Millennials are the largest generation in the United States, with 75,725,892 people (21.7%).

Q: How many Gen Z, Millennials and Baby Boomers are in the United States?

The United States has 73,104,496 Gen Z, 75,725,892 Millennials and 66,623,086 Baby Boomers.

Q: What share of the United States is Gen Z, and how does it rank?

Gen Z is 20.9% of the United States, the 58th-lowest Gen Z share of the 194 countries.

Q: How do the youngest and oldest generations compare in the United States?

The youngest generations, Gen Alpha and Gen Beta, together number 52,657,639 in the United States, versus 14,149,058 in the oldest two, the Silent and Greatest generations.

Q: How does the largest generation in the United States compare with the world?

Millennials are 21.7% of the United States, compared with 22.5% worldwide.

By Marko Visic · Updated October 19, 2026

A UN projection for 1 July 2026 from World Population Prospects 2024 (medium variant).

In the United States, Millennials are the largest generation: 75,725,892 people, 21.7% of the population.

See the population pyramid for the United States.

Gen Beta: 5,534,368 (1.6%)
Gen Alpha: 47,123,271 (13.5%)
Gen Z: 73,104,496 (20.9%)
Millennials: 75,725,892 (21.7%)
Gen X: 66,775,322 (19.1%)
Baby Boomers: 66,623,086 (19.1%)
Silent Generation: 13,989,482 (4.0%)
Greatest Generation: 159,576 (<0.1%)

349,035,494

people on 1 July 2026

21.7%

Millennials, the largest generation

20.9%

Gen Z share, the 58th-lowest of the 194 countries

52,657,639

under 14 (Gen Alpha + Gen Beta)

14,149,058

aged 81+ (Silent + Greatest)

Generation Population Distribution - United States

Gen Beta: 1.6%

Gen Alpha: 13.5%

Gen Z: 20.9%

Millennials: 21.7%

Gen X: 19.1%

Baby Boomers: 19.1%

Silent Generation: 4.0%

Greatest Generation: <0.1%

Generation Breakdown by Population - United States

Total Population: 349,035,494

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	5,534,368	1.6%	2,835,276	2,699,092
Gen Alpha	2013–2024	2–13 years	47,123,271	13.5%	24,159,896	22,963,376
Gen Z	1997–2012	14–29 years	73,104,496	20.9%	37,689,770	35,414,725
Millennials	1981–1996	30–45 years	75,725,892	21.7%	39,092,038	36,633,855
Gen X	1965–1980	46–61 years	66,775,322	19.1%	33,907,718	32,867,604
Baby Boomers	1946–1964	62–80 years	66,623,086	19.1%	31,937,144	34,685,943
Silent Generation	1928–1945	81–98 years	13,989,482	4.0%	5,737,064	8,252,419
Greatest Generation	before 1928	99+ years	159,576	<0.1%	40,208	119,368
Total			349,035,494	100.0%	175,399,113	173,636,381

Projected population on 1 July 2026, UN World Population Prospects 2024 (medium variant). Generation definitions: Pew Research Center (Greatest Generation to Gen Z); McCrindle Research (Gen Alpha, Gen Beta).

United States Generations: Frequently Asked Questions

Population on 1 July 2026, UN World Population Prospects 2024 (medium variant).

What is the largest generation in the United States?

Millennials are the largest generation in the United States, with 75,725,892 people (21.7%).

How many Gen Z, Millennials and Baby Boomers are in the United States?

The United States has 73,104,496 Gen Z, 75,725,892 Millennials and 66,623,086 Baby Boomers.

What share of the United States is Gen Z, and how does it rank?

Gen Z is 20.9% of the United States, the 58th-lowest Gen Z share of the 194 countries.

How do the youngest and oldest generations compare in the United States?

The youngest generations, Gen Alpha and Gen Beta, together number 52,657,639 in the United States, versus 14,149,058 in the oldest two, the Silent and Greatest generations.

How does the largest generation in the United States compare with the world?

Millennials are 21.7% of the United States, compared with 22.5% worldwide.

Explore Generation Data by Country

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