How does the author illustrate the theme, coming of age, in the novel, Ace Hits Rock Bottom?

Ace's developing maturity is an important theme in the novel. As the novel begins, Ace is forced to face the reality that he must be responsible for his debt. As Flo points out, Ace owes money for a water bed, black sheets, a wallmounted stereo, a tape deck, an Atari set, no-fog clock, a chiming telephone, many Claude Clerc shirts, and his Bloomingdale "nylon zebra pajamas." Flo insists that he get a job immediately. As Ace's luck has it, Jerry Cone, the Falcon's questionable agent, calls to offer him work at the Wartzburg Theater.