From where did pop art draw it's subject?

Pop art is an art movement that emerged in the United Kingdom and the United States during the late 1940s to the mid- to late-1950s. ... One of its aims is to use images of popular (as opposed to elitist) culture in art, emphasizing the banal or kitschy elements of any culture, most often through the use of irony.

Explanation:

the longest time is 123 years