Although millennials head fewer households than individuals belonging to other generations, a large percentage of the ones that do are living in poverty, a new study found. According to a Pew Research Center Opens a New Window. analysis of Census Bureau data, millennials made up about 5.3 million of the nearly 17 million U.S. households considered to be living below the poverty line in 2016. Comparatively, Generation Xers were at the head of 4.2 million and Baby Boomers led 5 million poor households.