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

Q: What is the largest generation in Ireland?

Gen X is the largest generation in Ireland, with 1,170,792 people (21.9%).

Q: How many Gen Z, Millennials and Baby Boomers are in Ireland?

Ireland has 1,156,196 Gen Z, 1,101,502 Millennials and 887,493 Baby Boomers.

Q: What share of Ireland is Gen Z, and how does it rank?

Gen Z is 21.6% of Ireland, the 67th-lowest Gen Z share of the 194 countries.

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

The youngest generations, Gen Alpha and Gen Beta, together number 835,734 in Ireland, versus 205,234 in the oldest two, the Silent and Greatest generations.

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

Gen X is 21.9% of Ireland, compared with 17.5% worldwide.

By Marko Visic · Updated October 19, 2026

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

In Ireland, Gen X is the largest generation: 1,170,792 people, 21.9% of the population.

See the population pyramid for Ireland.

Gen Beta: 80,374 (1.5%)
Gen Alpha: 755,360 (14.1%)
Gen Z: 1,156,196 (21.6%)
Millennials: 1,101,502 (20.6%)
Gen X: 1,170,792 (21.9%)
Baby Boomers: 887,493 (16.6%)
Silent Generation: 203,262 (3.8%)
Greatest Generation: 1,972 (<0.1%)

5,356,950

people on 1 July 2026

21.9%

Gen X, the largest generation

21.6%

Gen Z share, the 67th-lowest of the 194 countries

835,734

under 14 (Gen Alpha + Gen Beta)

205,234

aged 81+ (Silent + Greatest)

Generation Population Distribution - Ireland

Gen Beta: 1.5%

Gen Alpha: 14.1%

Gen Z: 21.6%

Millennials: 20.6%

Gen X: 21.9%

Baby Boomers: 16.6%

Silent Generation: 3.8%

Greatest Generation: <0.1%

Generation Breakdown by Population - Ireland

Total Population: 5,356,950

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	80,374	1.5%	41,251	39,122
Gen Alpha	2013–2024	2–13 years	755,360	14.1%	386,592	368,767
Gen Z	1997–2012	14–29 years	1,156,196	21.6%	589,133	567,063
Millennials	1981–1996	30–45 years	1,101,502	20.6%	540,480	561,022
Gen X	1965–1980	46–61 years	1,170,792	21.9%	577,108	593,684
Baby Boomers	1946–1964	62–80 years	887,493	16.6%	430,526	456,966
Silent Generation	1928–1945	81–98 years	203,262	3.8%	86,273	116,990
Greatest Generation	before 1928	99+ years	1,972	<0.1%	410	1,562
Total			5,356,950	100.0%	2,651,774	2,705,176

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).

Ireland Generations: Frequently Asked Questions

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

What is the largest generation in Ireland?

Gen X is the largest generation in Ireland, with 1,170,792 people (21.9%).

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

Ireland has 1,156,196 Gen Z, 1,101,502 Millennials and 887,493 Baby Boomers.

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

Gen Z is 21.6% of Ireland, the 67th-lowest Gen Z share of the 194 countries.

How do the youngest and oldest generations compare in Ireland?

The youngest generations, Gen Alpha and Gen Beta, together number 835,734 in Ireland, versus 205,234 in the oldest two, the Silent and Greatest generations.

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

Gen X is 21.9% of Ireland, compared with 17.5% worldwide.

Explore Generation Data by Country

Other countries in Europe. See all 194 countries →