Belgium 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 Belgium, Gen X is the largest generation: 2,456,254 people, 20.9% of the population.

See the population pyramid for Belgium.

Gen Beta: 152,723 (1.3%)
Gen Alpha: 1,456,420 (12.4%)
Gen Z: 2,225,753 (18.9%)
Millennials: 2,414,037 (20.5%)
Gen X: 2,456,254 (20.9%)
Baby Boomers: 2,420,806 (20.6%)
Silent Generation: 641,246 (5.4%)
Greatest Generation: 7,404 (0.1%)

11,774,642

people on 1 July 2026

20.9%

Gen X, the largest generation

18.9%

Gen Z share, the 39th-lowest of the 194 countries

1,609,143

under 14 (Gen Alpha + Gen Beta)

648,650

aged 81+ (Silent + Greatest)

Generation Population Distribution - Belgium

Gen Beta: 1.3%

Gen Alpha: 12.4%

Gen Z: 18.9%

Millennials: 20.5%

Gen X: 20.9%

Baby Boomers: 20.6%

Silent Generation: 5.4%

Greatest Generation: 0.1%

Generation Breakdown by Population - Belgium

Total Population: 11,774,642

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	152,723	1.3%	78,203	74,520
Gen Alpha	2013–2024	2–13 years	1,456,420	12.4%	744,744	711,676
Gen Z	1997–2012	14–29 years	2,225,753	18.9%	1,135,810	1,089,944
Millennials	1981–1996	30–45 years	2,414,037	20.5%	1,207,239	1,206,798
Gen X	1965–1980	46–61 years	2,456,254	20.9%	1,235,536	1,220,718
Baby Boomers	1946–1964	62–80 years	2,420,806	20.6%	1,160,411	1,260,396
Silent Generation	1928–1945	81–98 years	641,246	5.4%	247,836	393,410
Greatest Generation	before 1928	99+ years	7,404	0.1%	1,533	5,870
Total			11,774,642	100.0%	5,811,311	5,963,332

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).

Belgium Generations: Frequently Asked Questions

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

What is the largest generation in Belgium?

Gen X is the largest generation in Belgium, with 2,456,254 people (20.9%).

How many Gen Z, Millennials and Baby Boomers are in Belgium?

Belgium has 2,225,753 Gen Z, 2,414,037 Millennials and 2,420,806 Baby Boomers.

What share of Belgium is Gen Z, and how does it rank?

Gen Z is 18.9% of Belgium, the 39th-lowest Gen Z share of the 194 countries.

How do the youngest and oldest generations compare in Belgium?

The youngest generations, Gen Alpha and Gen Beta, together number 1,609,143 in Belgium, versus 648,650 in the oldest two, the Silent and Greatest generations.

How does the largest generation in Belgium compare with the world?

Gen X is 20.9% of Belgium, compared with 17.5% worldwide.

Explore Generation Data by Country

Other countries in Europe. See all 194 countries →