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

By Marko Visic · Updated October 19, 2026

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

In the United Kingdom, Millennials are the largest generation: 14,801,382 people, 21.2% of the population.

See the population pyramid for the United Kingdom.

Gen Beta: 1,033,990 (1.5%)
Gen Alpha: 9,338,332 (13.4%)
Gen Z: 13,722,048 (19.6%)
Millennials: 14,801,382 (21.2%)
Gen X: 14,131,477 (20.2%)
Baby Boomers: 13,286,847 (19.0%)
Silent Generation: 3,578,050 (5.1%)
Greatest Generation: 39,404 (0.1%)

69,931,528

people on 1 July 2026

21.2%

Millennials, the largest generation

19.6%

Gen Z share, the 46th-lowest of the 194 countries

10,372,322

under 14 (Gen Alpha + Gen Beta)

3,617,454

aged 81+ (Silent + Greatest)

Generation Population Distribution - United Kingdom

Gen Beta: 1.5%

Gen Alpha: 13.4%

Gen Z: 19.6%

Millennials: 21.2%

Gen X: 20.2%

Baby Boomers: 19.0%

Silent Generation: 5.1%

Greatest Generation: 0.1%

Generation Breakdown by Population - United Kingdom

Total Population: 69,931,528

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	1,033,990	1.5%	530,480	503,510
Gen Alpha	2013–2024	2–13 years	9,338,332	13.4%	4,788,865	4,549,467
Gen Z	1997–2012	14–29 years	13,722,048	19.6%	7,034,966	6,687,081
Millennials	1981–1996	30–45 years	14,801,382	21.2%	7,419,228	7,382,154
Gen X	1965–1980	46–61 years	14,131,477	20.2%	6,907,180	7,224,296
Baby Boomers	1946–1964	62–80 years	13,286,847	19.0%	6,278,573	7,008,274
Silent Generation	1928–1945	81–98 years	3,578,050	5.1%	1,484,494	2,093,557
Greatest Generation	before 1928	99+ years	39,404	0.1%	9,348	30,056
Total			69,931,528	100.0%	34,453,134	35,478,394

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 Kingdom Generations: Frequently Asked Questions

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

What is the largest generation in the United Kingdom?

Millennials are the largest generation in the United Kingdom, with 14,801,382 people (21.2%).

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

The United Kingdom has 13,722,048 Gen Z, 14,801,382 Millennials and 13,286,847 Baby Boomers.

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

Gen Z is 19.6% of the United Kingdom, the 46th-lowest Gen Z share of the 194 countries.

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

The youngest generations, Gen Alpha and Gen Beta, together number 10,372,322 in the United Kingdom, versus 3,617,454 in the oldest two, the Silent and Greatest generations.

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

Millennials are 21.2% of the United Kingdom, compared with 22.5% worldwide.

Explore Generation Data by Country

Other countries in Europe. See all 194 countries →