Millennials Now Dominate
As of July 1, 2019, the U.S. Census Bureau reports that millennials age 23-38 now outnumber the Baby Boom generation (previously the largest) age 55-73 by just under a million individuals. The actual numbers came to 72.1 million for Millennials vs. 71.6 million for the Boomers.
In addition, as young immigrants come into the country, the Millennial generation continues to grow. As a result of deaths exceeding immigration, Boomers are seeing declines in their population size.
The Millennial population is projected to peak in 2033 at 75.9 million individuals. After that, when the oldest Millennials turn 52, mortality will start to outweigh net immigration.
Generation X-ers, currently age 39 to 54, are not projected to outnumber Boomers until 2028, when there will be 63.9 Gen Xers and 62.9 million Boomers. The Gen X population peaked at 65.6 million in 2015. Generation Z, meanwhile, is still ramping up. The post-Millennial cohort was born anywhere from 1997 onward, so the Z generation is still being born while its oldest members are turning 22.