From Longman Dictionary of Contemporary Englishgeneration gapˌgeneˈration ˌgap noun [singular] the lack of understanding or the differences between older people and younger people
Examples from the Corpus
generation gap• He tells me that they had a discussion in school about the generation gap.• With class war anaesthetized by the Cold War and affluence, the generation gap and teenagers became a subject for serious observation.• This versatile book combines communicative activities with information on topics as varied as national customs, food, and the generation gap.• The results were stunningly successful and caught the flavour of Sixties London and the generation gap.• It seemed that he had a foot planted firmly on both sides of the generation gap.• The generation gap here was too wide.• The generation gap is another evil plan. 