This document discusses four generations: Baby Boomers, Generation X, Generation Y (Millennials), and Generation Z. It provides key details about each generation including current population sizes in the US, defining experiences, and characteristics. The document notes that Baby Boomers are the largest retiring generation in history and Generation Z is currently the youngest at ages 0-9, having grown up immersed in technology. In conclusion, it lists three references for further information about generational differences and their implications for education.