Social generations describe cohorts of people typically born within a date range who share similar cultural experiences. The names of the social generations are often the result of a historical event, a rapid social or demographic change or even a significant change in the calendar. Sources vary on specific years for each generation but there is consensus on general time periods. The significant change in the age structure in Colorado has lent itself to several questions related to the size and magnitude of Colorado's different generations. The purpose of this document is to describe and delineate through data the time periods of the "social generations" in Colorado and what they look like over time.