Australia 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 Australia, Millennials are the largest generation: 6,193,082 people, 22.7% of the population.

See the population pyramid for Australia.

Gen Beta: 461,412 (1.7%)
Gen Alpha: 3,810,600 (14.0%)
Gen Z: 5,428,028 (19.9%)
Millennials: 6,193,082 (22.7%)
Gen X: 5,228,048 (19.2%)
Baby Boomers: 4,870,996 (17.9%)
Silent Generation: 1,220,636 (4.5%)
Greatest Generation: 14,294 (0.1%)

27,227,096

people on 1 July 2026

22.7%

Millennials, the largest generation

19.9%

Gen Z share, the 50th-lowest of the 194 countries

4,272,012

under 14 (Gen Alpha + Gen Beta)

1,234,930

aged 81+ (Silent + Greatest)

Generation Population Distribution - Australia

Gen Beta: 1.7%

Gen Alpha: 14.0%

Gen Z: 19.9%

Millennials: 22.7%

Gen X: 19.2%

Baby Boomers: 17.9%

Silent Generation: 4.5%

Greatest Generation: 0.1%

Generation Breakdown by Population - Australia

Total Population: 27,227,096

Generation	Birth Years	Age Range (2026)	Population	% of Total	Male	Female
Gen Beta	2025–2039	0–1 years	461,412	1.7%	236,733	224,680
Gen Alpha	2013–2024	2–13 years	3,810,600	14.0%	1,957,106	1,853,495
Gen Z	1997–2012	14–29 years	5,428,028	19.9%	2,785,132	2,642,896
Millennials	1981–1996	30–45 years	6,193,082	22.7%	3,089,876	3,103,206
Gen X	1965–1980	46–61 years	5,228,048	19.2%	2,573,314	2,654,734
Baby Boomers	1946–1964	62–80 years	4,870,996	17.9%	2,333,386	2,537,610
Silent Generation	1928–1945	81–98 years	1,220,636	4.5%	531,866	688,769
Greatest Generation	before 1928	99+ years	14,294	0.1%	3,770	10,523
Total			27,227,096	100.0%	13,511,184	13,715,912

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).

Australia Generations: Frequently Asked Questions

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

What is the largest generation in Australia?

Millennials are the largest generation in Australia, with 6,193,082 people (22.7%).

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

Australia has 5,428,028 Gen Z, 6,193,082 Millennials and 4,870,996 Baby Boomers.

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

Gen Z is 19.9% of Australia, the 50th-lowest Gen Z share of the 194 countries.

How do the youngest and oldest generations compare in Australia?

The youngest generations, Gen Alpha and Gen Beta, together number 4,272,012 in Australia, versus 1,234,930 in the oldest two, the Silent and Greatest generations.