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

In many ways, 18-year-olds now look like 14-year-olds in previous generations. For example, only about half of 12th graders date, about the same as 8th graders in the early 1990s.