Gen Z is now the world’s largest generation, with an estimated 2.04 billion people - 24.8% of the global population. Millennials follow at 1.87 billion (22.6%), while Gen Alpha accounts for 1.74 billion (21.1%).

Together, these three generations represent about 5.65 billion people, or 68.5% of humanity. Nearly 62% of the global population is under 40, placing an extraordinary share of the world in childhood, early adulthood or core working age.

The implications are broad. Millennials are shaping housing, family formation and labor markets; Gen Z is rapidly entering the workforce and redefining expectations around technology, flexibility and purpose; Gen Alpha will grow up in a world increasingly shaped by AI, climate pressures and digital infrastructure.

The bigger story is not simply which generation is largest, but how three massive cohorts are moving through very different life stages at the same time, reshaping education, work, consumption and public policy.

Sources: DataReportal, Oct. 2025. Generational estimates and methodology by World Visualized. Additional analysis: Deloitte, UNICEF, Pew Research Center.