“[A] group of all persons born within a limited span of years…Belonging to a cohort-group… is permanent, involuntary and only applies to a finite number of individuals. All members of the cohort-group— from birth to death— encounter the same national events, moods, and trends at similar ages.” (Strauss & Howe)

Strauss, W. & Howe, N. (1991). Generations: The history of America’s future, 1584 to 2069. New York: William Morrow.