1950s youth sub-culture (5,4)
I believe the answer is:
teddy boys
(Other definitions for teddy boys that I've seen before include "Tough youths in the 1950s" , "Youth of 1960s who wore Edwardian style clothes" , "Young 1950s' males sporting Edwardian-style clothes" , "Rock 'n' roll youths of the 1950s and 1960s" .)