“Is theater failing to attract a new generation of enthusiasts to replace those who, on the opposite end of the chronological scale, die off or become too frail to go out at night?” There’s certainly no question that the predominant audience at your average mainstream theater is decidedly, um, mature, but some in the industry insist that the overall audience has expanded, regardless of demographic shifts. Still, “in the decade between 1992 and 2002, the percentage of young people in the overall theater audience shrank significantly.”