Theme
The theme in the story The Moustache by Robert Cormier is that the main character wants to grow up fast and decides to grow a moustache, but after visiting his grandmother at the hospital and hearing the things she told him he realizes that there is no rush to growing up and at the end of the story he shaves off his mustache The theme is you don't have to hurry up to get older take you time , you might not be ready to be an adult.