They go back to the 50s.

Greasers are a youth subculture that emerged in the 1950s and early 1960s from predominantly working class and lower class teenagers and young adults in the United States. The subculture remained prominent into the mid-1960s and was particularly embraced by certain ethnic groups in urban areas, particularly Italian Americans, Irish Americans, and Latino Americans.
The greaser subculture may have emerged in the post-World War II era among the motorcycle clubs and gangs of the late 1940s in the United States, though it was certainly established by the 1950s, when it was increasingly adopted by ethnic urban youth.