In 2012, 36% of the nations young adults ages 18 to 31 the so-called Millennial generationwere living in their parents home, according to a new Pew Research Center analysis of U.S. Census Bureau data. This is the highest share in at least four decades and represents a slow but steady increase over the 32% of their same-aged counterparts who were living at home prior to the Great Recession in 2007 and the 34% doing so when it officially ended in 2009.