As children grow older, their need for independence increases. At some point, your child may ask to go to the movies, or cinemas, alone. At what age would you let your child go to the movie theaters alone?
When they learn how to respect the cinema and its patrons. If a child still hasn't learnt not to put their feet up on the chairs or not to throw popcorn and make a general nuisance of an experience for others then they are not mature enough to go on their own.