Age: 17 years old Birthday: April 21, 1997 Born: California Birth Sign: Taurus Other:,,,, Vimeo Videos Search results. Learn about Sydney Sierota: her birthday, what she did before fame, her family life, fun trivia facts, popularity rankings, and more. With Echosmith, she signed with Warner Bros Records in 2012 and released her first album in 2013. Alexandra Daddario 16 March 1986 — an exciting and sexy actress from America. Her father O.