| a lack of communication between one generation and another, esp. between young people and their parents, brought about by differences of tastes, values, outlook, etc. |

| generation gap n. A difference in values and attitudes between one generation and another, especially between young people and their parents. |
The differences in customs, attitudes, and beliefs between any two generations, but especially between youths and adults.
generation gap
A broad difference in values and attitudes between one generation and another, especially between parents and their children. For example, There's a real generation gap in their choice of music, restaurants, clothing
you name it. [1960s"