For Strauss and Howe, these boundaries were defined by the phases of the secular cycle, which are now associated with the Anglo-American historical division (Greatest Generation (1901-1924), Silent Generation (1925-1945), Baby Boomers (1946-1964), Generation X (1965-1981), Generation Y (Millennials 1982-1994), Generation Z (1995-2012), Alpha (2013-2025)).