This guy literally just showed up out of nowhere and is now an overnight "teen hearthrob"... but you know, I can kinda relate to that, because embarrassingly, my voice didn't start to change until I was about 14 or 15, myself.Justin Bieber is 16. If you asked me who was that talking when he was doing some "We'll be right back" message on Radio Disney, I would have guessed that it was a 10-year-old.