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"Hello?" I said. I made my voice quite deep so that she wouldn't suspect my age or anything. I have a pretty deep voice anyway. (9.19)
Holden must have the worst fake I.D. ever, because he’s constantly trying to fool people about his age and failing. For someone obsessed with childhood, he sure is eager to seem older.
[…] You should've seen him when old Sally asked him how he liked the play. He was the kind of a phony that have to give themselves room when they answer somebody's question. He stepped back, and stepped right on the lady's foot behind him. He probably broke every toe in her body. […] Then he and old Sally started talking about a lot of people they both knew. It was the phoniest conversation you ever heard in your life. They both kept thinking of places as fast as they could, then they'd think of somebody that lived there and mention their name. I was all set to puke when it was time to go sit down again. I really was. (17.14)
Holden has this puking problem a lot: every time someone’s particularly phony, he feels like puking. Sure, it’s partly a figure of speech. But it’s also part of his actual physical aversion to life—life literally makes him sick.