What is the theme in This Is Our Youth by Kenneth Lonergan?

Coming of Age is the main theme of this book. All three main characters are on the brink of adulthood but are having difficulties with the transition. They have been living in a state of stasis, supported by their wealthy parents, who demand only that their children leave them alone. None of them has been forced to examine his or her empty life or to determine the future. Their days are spent thinking only about how they can fulfill their immediate desires: drugs, alcohol, and sex. Only Warren shows any development toward maturation, as he begins to realize the meaninglessness at the heart of their existence.