Question: How old was the American singer born on December 7, 1987, the youngest winner of the award for male artist at the Teen Choice Awards?
Sentence (from "2013 Teen Choice Awards"): This was the last "Teen Choice Award" ceremony to take place at the Gibson Amphitheatre due to the venue closing down in September 2013, to make room for The Wizarding World of Harry Potter. ""
Relevant evidence: No