Generation gap is defined as the vast differences in terms of attitudes, experiences and taste between people born a certain amount of time apart who are living at the same time.
An example of a generation gap is the knowledge of the older baby boomers about computers versus the knowledge of young people born after the Internet had already exploded and taken off.
the set of differences in ideals, attitudes, experiences, etc. that exist between an older and a younger generation of people living at the same time
A difference in values and attitudes between one generation and another, especially between young people and their parents.