Classic movies generally refer to films produced during the "Golden Age of Hollywood," roughly spanning from the late 1920s to the mid-1960s (approx. 1927–1967). This era is defined by the studio system, the rise of sound, and specific, iconic stylistic conventions. Some broader definitions extend this period to include films up to 1970–1975, or define a classic as any highly influential film that is at least 20–30 years old.