Neither of those things are true, at least...the second one is not.
Spring Awakening is going non-eq soon, as far as I know, and you only need to be 18 to play Wendla or Melchior, as they engage in some pretty heavy stuff throughout the show.
When the '68 version of Romeo and Juliet premiered, Oliva Hussey was not allowed to go to the premier because the movie had nudity in it. It was her breast and Leonard Whiting's rear end. As of right now, I don't know the correlation between being 18 to be in Spring Awakening and Oliva Hussey being underage, but the one make me think of the other, so I apologize if that's out of nowhere.
Into the Woods, Beauty and the Beast, RENT, Mamma Mia!, Dr. Jeckyll and Mr. Hyde, Evita (with Julia Murney), Hairspray (with Paul Vogt), Peter and the Starcatchers (with Christian Borle), Lion King, Altar Boyz, Legally Blonde (with Lauren Zackrin).