Thanks to increased life spans, at least six distinct generations live side by side in the United States today. Over time, they have earned names based on how they behave and the historical events that influenced them. Don’t miss our latest facts, findings, and survey results in The Rundown., Generations are one way to group age cohorts. A generation typically refers to groups of people born over a 15-20 year span, such as the Millennial generation, currently the youngest adult generation. Generational analysis is an important tool used by Pew Research Center and other researchers., (WYTV) — The Pew Research Center is back with the new generation groupings, you know: Baby Boomers, Millennials — just who is who? And Pew has added a new category: Generation Alpha. Here, A generation typically refers to groups of people born over a 15-20 year span, such as the Millennial generation, currently the youngest adult generation. Generational analysis is an important tool used by Pew Research Center and other researchers., Pew Research Center has been studying the Millennial generation for more than a decade. But as we enter 2018, it’s become clear to us that it’s time to determine a cutoff point between Millennials and the next generation., Pew Research Center has been studying the Millennial generation for more than a decade. But by 2018, it became clear to us that it was time to determine a cutoff point between Millennials and the next generation..