“A generation is defined as an identifiable group that shares birth years, age location, and significant life events at critical developmental stages, divided by five-seven years into the first wave, core group, and last wave (Kupperschmidt, 2000)” (Smola & Sutton, 2002, p. 364).

Smola, K.W., & Sutton, C.D. (2002). Generational differences: Revisiting generational work values for the new millennium. Journal of Organizational Behavior, 23, 363-382.