Marjane Satrapi knows many things, or, at least she thinks she does. At a young age, she displayed some acts that show her immaturity in regards to knowledge and continued to do so as she grew older. By the end of The Complete Persepolis, Marjane had shown that she had indeed grown up and is more wise, but has yet to fully mature.
Around the time when she was six-to-ten years old, she listened to political discussions between her father and uncle, who stayed with her family for a short while, and voiced her own opinion at times, one time saying, "On TV, they say that 99.99% of the population voted for the Islamic Republic" (Satrapi 62). After her father uses that example to tell off Marjane's uncle, she cried out, "But it's not my fault! It's the TV!! Boo hoo!!!" (62), showing the immature mind she had back then as a child.
Even at the age of 21, she still shows that she still has much to learn. At that age, she was going to be married to a man named Reza, who she was in a relationship with for quite some time. Marjane did have to think about his proposal and even had to consult her father on the topic, and in the end, with her father's blessing, she and Marjane made the engagement official. However, the only reason Marjane's father allowed her to marry was because he wanted to teach her a lesson. "Long afterward my father admitted to me that he had always known that I would get divorced. He wanted me to realize by myself that Reza and I were no made for each other. He was right," (313).
Marjane has shown her maturity, naturally, since she grew up, but she has yet to reach her full maturity.