1) Media representations of youth in the 1950s were rather simplistic, typically portraying teenagers as well-behaved and conforming or rebelling against strict adult authority.
2) Films like Rebel Without a Cause in the 1950s and Quadrophenia in the 1970s showed rebellious, "delinquent" youth behavior but also portrayed the emotional struggles of teenagers and generational conflicts with parents.
3) More recent films and TV shows provide more complex representations of youth, showing both rebellious behavior but also understanding of social and family issues facing teenagers today.