What is Generation Gap?

Legal Definition
A generation gap or generational gap, is a difference of opinions between one generation and another regarding beliefs, politics, or values. In today's usage, "generation gap" often refers to a perceived gap between younger people and their parents and/or grandparents.
-- Wikipedia
Legal Definition
Differences between older and younger age groups. Technological advances often widened these gaps. Opinions, tastes, beliefs, and other social and cultural norms are the basis of these differences.