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 "Premio Lo Nuestro 2003"): In the Regional Mexican, Pilar Montenegro took three awards for Regional Mexican Song of the Year, Pop Song of the Year ("Quitame Ese Hombre"), and for Best Regional Mexican Female Artist.
Relevant evidence: No