In this informative article, Jay Serafino discusses the new guidelines offered by the Pew Research Center when defining the birth years for Generation X, Millennials and Post Millennials. He outlines some of the major global events and trends that serve as dividing lines between generations, including 9/11, the 2008 recession and technological advancements, noting how these factors impact the way in which different generational groups experience the world socially, economically, politically, and technologically.