To watch an R-rated movie, you generally need to be at least 17 years old. If you are under 17, you must be accompanied by a parent or adult guardian, usually 21 years or older, who stays with you throughout the entire movie. Children under 6 are typically not allowed to attend R-rated movies at all. Some theaters may have stricter policies, such as requiring the accompanying adult to be 25 or older, or not allowing anyone under 18 without an adult, depending on local rules or theater chain policies

. In summary:

• Age 17 or older: Can watch R-rated movies alone (with valid ID).
• Under 17: Must be accompanied by an adult (usually 21+).
• Under 6: Not admitted to R-rated movies.
• Accompanying adult must stay for the entire movie.

These rules are based on the Motion Picture Association film rating system and are enforced by most theaters in the U.S.