United States Generation Breakdown 2026: How Many Millennials, Gen Z, and Boomers?
In the United States, Millennials are the largest generation: 75,725,892 people, 21.7% of the population.
Population on 1 July 2026, UN World Population Prospects 2024 (medium variant). 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%)
Generation Population Distribution - United States
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 | ||
Population on 1 July 2026, UN World Population Prospects 2024 (medium variant). Generation definitions: Pew Research Center (Silent–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
Africa
Asia
Europe
Latin America and the Caribbean
Northern America
Popular countries:
Compare generation sizes across 194 countries. See how many Millennials, Gen Z, Boomers, and other generations live in each country on UN population data.