(CNN)Here's a look at six generations of Americans in the 20th century: the Greatest Generation (or GI Generation), the Silent Generation, baby boomers, Generation X, millennials and Generation Z. In order to examine economic trends and social changes over time, demographers compare groupings of people bracketed by birth year. There are sometimes variations in the birth year that begins or ends a generation, depending on the source. The groupings below are based on studies by the US Census, Pew Research and demographers Neil Howe and William Strauss.
Born in 1924 or earlier.