America Is Full of 23-Year-Olds Last year, that age group (then 22) overtook boomers By Newser Editors, Newser Staff Posted May 23, 2014 4:27 PM CDT 60 comments Comments (Shutterstock) (Newser) – The New York Times takes note of a demographic milestone in the US: Twenty-somethings have overtaken the baby boomers. Last year, the largest single age group in the country was 22-year-olds, followed by 23- and 21-year-olds. Boomers finally showed up in fourth place, represented by 53-year-olds. In fact, people in their 20s made up the largest single 10-year group in 2013. At the other end of the age spectrum, those 65 or older made up 14% of the population, a figure expected to increase to 20% by 2030. Click for the full story, with charts.