In the opening chapters, Holden's immaturity is shown through various interactions. Before getting kicked out of Pencey Prep in Agerstown, Pennsylvania, his roommate was Ward Stradlater and his neighbor was Robert Ackley. An example of his immaturity is when Ackley is in Holden's room and Holden says:
" I pulled the old peak of my hunting hat around to the front, then pulled it way down over my eyes. That way, I couldn't see a goddamn thing. 'I think I'm going blind,' I said in this very hoarse voice. 'Mother darling, everything's getting so dark in here'" (21).
When Holden does this, Ackley gets annoyed with him, and tells him to grow up. In Holden's mind, he isn't being immature. He says he is just "horsing around," but it's a way a child would behave. Another example of his immaturity is when Stradlater is shaving and Holden says he felt like horsing around and jumps on him and gets him in a half nelson. Holden's immaturity show through his actions because he doesn't realize they are childish acts, and it causes his friends to become annoyed with him. A major factor in Holden being the way he is, is the death of his younger brother Allie. His brother Allie's death caused him to think that people disappear and when they grow up they disappear, resulting in him being afraid of falling out of innocence. From that point on, Holden strived to protect his childhood.