postwar generation
Refers to the generation that came of age after World War II, often associated with new cultural and social values distinct from prewar generations.
Postwar-generation writers explored new forms of literature.
Specifically the baby-boom generation born shortly after WWII, while 戦後派 is broader, encompassing anyone shaped by the postwar era.
Compound of 戦後 (postwar) and 派 (faction, group). The term emerged in the mid-20th century to categorize people by their postwar experience.