How do we define Millennials, Baby Boomers and Gen X'ers? While no individual should be judged by the year of their birth, large groups of people tend to have different life experiences based on when they were born. Older Americas, for example, may have experienced the Great Depression, World War II and the Swinging Sixties, and this affects both their worldview and their economic impact on other generations. Starting with the oldest still alive, Glenn Campbell reviews the commonly accepted generations and explains how they experienced the world.