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Longman Dictionary of Contemporary English
youth culture
noun
EXAMPLES FROM CORPUS
▪ But this remedy fails to confront the reality of a male youth culture nearly immune to all the blandishments of established society.
▪ From the perspective of youth culture and pop music two aspects of this are significant.
▪ Pop music and its link with youth culture should be an important field of study in media education.
▪ Similarly, cultural and population dynamics have meant that there is now a major youth culture, with its associated markets.
▪ State authorities attempting to regulate youth culture are seen as little more than parent substitutes.
WordNet
youth culture

n. young adults (a generational unit) considered as a cultural class or subculture

Wikipedia
Youth culture

Youth culture is the way adolescents live, and the norms, values, and practices they share. Culture is the shared symbolic systems, and processes of maintaining and transforming those systems. Youth culture differs from the culture of older generations.

Elements of youth culture include beliefs, behaviors, styles, and interests. An emphasis on clothes, popular music, sports, vocabulary, and dating set adolescents apart from other age groups, giving them what many believe is a distinct culture of their own. Within youth culture, there are many distinct and constantly changing youth subcultures. These subcultures' norms, values, behaviors, and styles vary widely, and may differ from the general youth culture. Understanding what adolescents think and do is fundamental to understanding the relationship between structure and agency, social patterns and individual action.