In a switch, working-age people now make up the majority in U.S. households that rely on food stamps, according to an analysis of government data for The Associated Press by economists at the University of Kentucky. Just a few years ago, kids and the elderly were the main recipients. Since 2009, more than 50 percent of U.S. households receiving food stamps have been adults ages 18 to 59, according to the Census Bureau's Current Population Survey. That compares to 1998, when the working-age share of food stamp households was at a low of 44 percent, according to the researchers at the University of Kentucky. The food stamp program now covers 1 in 7 Americans.