Gen X'd Out May 9, 2014 The NPD Group noted a similar shift in a recent report. “The influence of boomers and older on eating patterns will fade as their households and populations shrink, and the impact of Generation Z (ages 0-23) and Millennials (ages 24-37), which made up over half of the U.S. population in 2013, will significantly increase,” the researcher reported. Millennials are not 37 fyi.