For decades, a baby boomer age has had the largest single-year population in the United States. No more. Now boomers have lost the title to their millennial children, with 22-year-olds claiming first place, according to the U.S. Census.
Coming in second are 23-year-olds, with 53-year-old boomers in third place. This represents a major demographic shift, considering that from 1947, a year after the baby boom began, until 2010, a boomer age group always held the top spot.