Lions Gate Films and IFC Films, the movie's distributors, said an appeals board for the Motion Picture Association of America rejected their request to reduce the rating to PG-13.
The R rating prohibits those 17 and younger from seeing "Fahrenheit 9/11" without an adult.
Moore urged younger teenagers to go see the film anyway. "I encourage all teenagers to come see my movie, by any means necessary. If you need me to sneak you in, let me know," he said.
