What is the difference between the movie ratings R (17+), X (19+) and XXX (21+) other than age, and what do they mean? - Quora

Answer (1 of 2): The question misrepresents the age restrictions of the R, obsolete X, and unofficial “XXX” ratings for films shown in the United States. NC-17 (formerly called X) is the film rating that may properly be considered to be “17+”. There are no official or widely adopted film ratings

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