“A difference in attitudes between people of different generations, leading to lack of understanding” (Generation Gap, 2004).
“The differences in values, lifestyles, and economic opportunities that exist between people of different age cohorts living in the same society” (Barker, 2003, p. 176).

"generation gap n." Soanes, C. and Stevenson, A. (Ed.). (2004). The concise Oxford English dictionary. [Online]. Oxford: Oxford University Press. Oxford Reference Online. BLC Boston College Libraries. Retrieved June 8, 2005 from Barker, R.L. (2003). The social work dictionary (5th ed.). Washington, DC: NASW Press.