Pew Research Center
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Millennials overtake Baby Boomers as America’s largest generation

Millennials have surpassed Baby Boomers as the nation’s largest living generation, according to population estimates released this month by the U.S. Census Bureau. Millennials, whom we define as those ages 18-34 in 2015, now number 75.4 million, surpassing the 74.9 million Baby Boomers (ages 51-69). And Generation X (ages 35-50 in 2015) is projected to pass the Boomers in population by 2028.

The Millennial generation continues to grow as young immigrants expand its ranks. Boomers – whose generation was defined by the boom in U.S. births following World War II – are older and their numbers shrinking as the number of deaths among them exceeds the number of older immigrants arriving in the country.

Generations are analytical constructs, and developing a popular and expert consensus on what marks the boundaries between one generation and the next takes time. Pew Research Center has established that the oldest “Millennial” was born in 1981. The Center continues to assess demographic, attitudinal and other evidence on habits and culture that will help to establish when the youngest Millennial was born or even when a new generation begins. To distill the implications of the census numbers for generational heft, this analysis assumes that the youngest Millennial was born in 1997.

Here’s a look at some generational projections:

Millennials

Generation X

Baby Boomers

This post was originally published on Jan. 16, 2015, and updated on April 25, 2016, to indicate that Millennials have officially surpassed Baby Boomers in population.

Related posts:

5 facts about Millennial households

Generation X: America’s neglected ‘middle child’