Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents—and What They Mean for America's Future

by Jean M. Twenge

By the 1960s and 1970s the highly individualistic world we know today had begun to emerge in many countries around the world: Personal choice was paramount, the U.S. military became an all-volunteer force, and “do your own thing” became a mantra.