Holden often experiences suicidal thoughts, and things that "depress the hell out of him", which is another symptom for depression. Holden also constantly has trouble sleeping and smokes, which causes him to fatigue easily and weakens his body. Also, in the last chapter Holden is watching Phoebe on a carousel, and immediately begins to feel joy, even though he was sad and depressed before, which is a mood swing, a symptom of depression. In addition, roughly 17% of adults experience depression in their lives, meaning that it is likely that Holden is experiencing depression, and that it most commonly appears in late teenage years to early twenties. "Everybody was asleep or out or home for the weekend, and it was very, very quiet and depressing in the corridor.…