South Korea 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 South Korea, Gen X is the largest generation: 13,297,888 people, 25.8% of the population.

See the population pyramid for South Korea.

Gen Beta: 373,068 (0.7%)
Gen Alpha: 3,980,298 (7.7%)
Gen Z: 8,631,568 (16.7%)
Millennials: 11,420,854 (22.1%)
Gen X: 13,297,888 (25.8%)
Baby Boomers: 11,429,558 (22.2%)
Silent Generation: 2,441,116 (4.7%)
Greatest Generation: 26,038 (0.1%)

51,600,388

people on 1 July 2026

25.8%

Gen X, the largest generation

16.7%

Gen Z share, the 17th-lowest of the 194 countries

4,353,366

under 14 (Gen Alpha + Gen Beta)

2,467,154

aged 81+ (Silent + Greatest)

Generation Population Distribution - South Korea

Gen Beta: 0.7%

Gen Alpha: 7.7%

Gen Z: 16.7%

Millennials: 22.1%

Gen X: 25.8%

Baby Boomers: 22.2%

Silent Generation: 4.7%

Greatest Generation: 0.1%

Generation Breakdown by Population - South Korea

Total Population: 51,600,388

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	373,068	0.7%	191,614	181,453
Gen Alpha	2013–2024	2–13 years	3,980,298	7.7%	2,038,720	1,941,578
Gen Z	1997–2012	14–29 years	8,631,568	16.7%	4,476,315	4,155,253
Millennials	1981–1996	30–45 years	11,420,854	22.1%	6,020,888	5,399,966
Gen X	1965–1980	46–61 years	13,297,888	25.8%	6,702,670	6,595,219
Baby Boomers	1946–1964	62–80 years	11,429,558	22.2%	5,456,582	5,972,976
Silent Generation	1928–1945	81–98 years	2,441,116	4.7%	838,272	1,602,844
Greatest Generation	before 1928	99+ years	26,038	0.1%	1,804	24,234
Total			51,600,388	100.0%	25,726,865	25,873,523

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).

South Korea Generations: Frequently Asked Questions

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

What is the largest generation in South Korea?

Gen X is the largest generation in South Korea, with 13,297,888 people (25.8%).

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

South Korea has 8,631,568 Gen Z, 11,420,854 Millennials and 11,429,558 Baby Boomers.

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

Gen Z is 16.7% of South Korea, the 17th-lowest Gen Z share of the 194 countries.

How do the youngest and oldest generations compare in South Korea?

The youngest generations, Gen Alpha and Gen Beta, together number 4,353,366 in South Korea, versus 2,467,154 in the oldest two, the Silent and Greatest generations.

How does the largest generation in South Korea compare with the world?

Gen X is 25.8% of South Korea, compared with 17.5% worldwide.

Explore Generation Data by Country

Other countries in Asia. See all 194 countries →