The main character is a 17 year old boy named Mike. He grew a mustache and kept it, because he thought it would make him seem older and more mature, even though it had negative side effects. He gets charged full price at the theater, and because of this, doesn’t have enough money to take his girlfriend out to eat after they watch a movie. She doesn’t really like the mustache either. Mike tries really hard to be mature, maybe even too hard. He wants others to think of him as an adult and treat him like he’s not a kid. His actions throughout the story prove this.
During his drive to see his sick grandma, he wants to use his dad’s fast car, and go 75 miles per hour on the highway. But he thinks that speeding isn’t mature, so he uses an old station wagon and only goes 50 miles per hour on the highway. This further shows that Mike wants to seem grown up. While he’s in the hospital room with is grandma, she hallucinates and thinks that he is her husband. He plays along and doesn’t correct her because his mother told him to be gentle with his grandmother. He doesn’t want to upset her, and seem childish or immature.
At the end of his visit, he wants to tell his grandmother that he’s her grandson, not her husband. He even considers continuing pretending to be her husband, but he doesn’t say anything. He just silently leaves. On his way home, he drives 80 miles per hour on the highway. He blasts rock music at maximum volume. When he gets home, he didn’t tell his parents how his visit went. He goes upstairs, and shaves off his mustache. By taking these actions, he embraces his immaturity. But by embracing his immaturity and ending his quests to seem mature, he becomes more mature. He realizes being immature has its perks, and is going to make use of them while he still can.