Question: How old was the performer of Supergirl when she started Hannah Montana?

full_context: Document 1: Ordinary Girl (Hannah Montana song): "Ordinary Girl" is a song by American singer–songwriter and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she plays on the Disney Channel television series "Hannah Montana". It was released to Radio Disney on July 2, 2010 as promotion for the fourth season of "Hannah Montana". Lyrically, the track speaks about how Hannah Montana might be famous, but she is just an ordinary girl underneath. The song was later released on July 6, 2010 through digital distribution as the lead single from the soundtrack of the same title as the special title ("Hannah Montana Forever") of the fourth and final season of the series.
Document 2: Pumpin' Up the Party: "Pumpin' Up the Party" is a pop song by American recording artist and actress Miley Cyrus. She is performing as Hannah Montana – the alter ego of Miley Stewart, a character she played on the Disney Channel television series "Hannah Montana". "Pumpin' Up the Party" was written and produced by Jaime Houston. The song was released to Radio Disney as promotion for the series and its first soundtrack, "Hannah Montana". The song has teen pop and dance-pop influences.
Document 3: Hannah Montana: Hannah Montana, also known as Hannah Montana Forever in its fourth and final season, is an American musical comedy television series created by Michael Poryes, Rich Correll, and Barry O'Brien. It focuses on Miley Stewart (portrayed by Miley Cyrus), who is a teenager living a double life as an average schoolgirl by day and as the famous recording artist Hannah Montana by night, which she keeps secret and only a few people know of her alter ego. The story follows the daily life of Stewart, her brother Jackson, her best friends Lily and Oliver, and her father Robby (Cyrus's real-life country singer father, Billy Ray Cyrus).
Document 4: Who Said: "Who Said" is a pop song by American recording artist and actress Miley Cyrus. She is performing as Hannah Montana – the alter ego of Miley Stewart, a character she plays on the Disney Channel television series "Hannah Montana". The song was written by Matthew Gerrard, Robbie Nevil, and Jay Landers and produced by Gerrard. It was released on July 11, 2006 by Walt Disney Records as a promotional single from the series' first soundtrack, "Hannah Montana". "Who Said" bears teen pop aspects musically, while its lyrics are about individualism.
Document 5: Hannah Montana (season 1): The first season of the television series Hannah Montana was aired on Disney Channel from March 24, 2006 to March 30, 2007, and included 26 episodes. It introduces the five main characters of the series and Miley Stewart's situation of living a secret double life as a teen pop star. The season also introduces several significant recurring characters such as Roxy Roker, Jake Ryan, and Rico Suave.
Document 6: Breakout (Miley Cyrus album): Breakout is the second studio album by American recording artist Miley Cyrus, released on July 22, 2008 by Hollywood Records. It is her first record that is not affiliated with the television series "Hannah Montana", in which Cyrus portrays the title character Hannah Montana. She co-wrote eight of its thirteen tracks, several of which with the assistance of Antonina Armato and Tim James. The majority of the record was composed as she traveled during her headlining Best of Both Worlds Tour (2007–08). Overall, "Breakout" is dominant on pop rock but explores a variety of other musical genres. Lyrical themes addressed in the album relate to breakups and coming of age. An international version was reissued on September 1, 2008.
Document 7: Hannah Montana (soundtrack): Hannah Montana is the soundtrack album for the first season of the television series "Hannah Montana", released on October 24, 2006 by Walt Disney Records. The program itself premiered through the Disney Channel on March 24, 2006; after becoming an immediate commercial success, production on its soundtrack began the following month. Eight of its thirteen tracks are performed by the series' primary actress Miley Cyrus, and are credited to her character Hannah Montana. The groups The Click Five, Everlife, B5, and recording artist Jesse McCartney each contribute one recording, while a duet between Cyrus and her father Billy Ray Cyrus is included as the final track. "Hannah Montana" was reissued as a two-disc special edition on March 20, 2007. The soundtrack was further promoted during the Cheetah Girls' Party's Just Begun Tour, for which Cyrus served as an opening act, and her own Best of Both Worlds Tour.The soundtrack is primarily a teen pop record, which sees additional influences from pop rock and country pop musical styles. The lyrical themes revolve largely around "girl power", teen romance, and the double life that Cyrus' character lives on the program.
Document 8: Gonna Get This: "Gonna Get This" is a pop song by American singer-songwriter and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she plays on the Disney Channel television series "Hannah Montana". It also features vocals from R&B singer Iyaz. It was released to Radio Disney on September 24, 2010 as promotion for the fourth season of "Hannah Montana". The song is musically dance-pop based. The song was later released on October 5, 2010 through iTunes as a single from the soundtrack of the same title as the special title ("Hannah Montana Forever") of the fourth and final season of the series.
Document 9: He Could Be the One: "He Could Be the One" is a pop song by American recording artist and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she played on the Disney Channel television series "Hannah Montana". The song was co-written and co-produced by Kara DioGuardi and Mitch Allan. "He Could Be the One" was released to Radio Disney on June 12, 2009 as promotion for an episode of the same title and the series' third soundtrack, "Hannah Montana 3". A karaoke version is available in "Disney's Karaoke Series: Hannah Montana 3". The song contains country pop elements in its music.
Document 10: 7 Things: "7 Things" is a song by American singer Miley Cyrus. The song was co-written by Cyrus, Antonina Armato and Tim James, and produced by John Fields. It was released on June 17, 2008 by Hollywood Records as the lead single from the first studio album released by Cyrus with no ties to her character Hannah Montana from the Disney Channel comedy series of the same name. Also registered as "Seven Things I Hate About You", Cyrus developed the song during the Best of Both Worlds Tour while feeling numerous emotions for an ex-boyfriend, mainly anger. The song's release brought allegations that it was about Nick Jonas of the Jonas Brothers, which Cyrus neither confirmed nor denied. Musically, "7 Things" bears aspects of both country and pop punk, while the lyrics in the song's refrain list seven traits Cyrus hates about an ex-boyfriend.
Document 11: Supergirl (Hannah Montana song): "Supergirl" is a pop song by American recording artist and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she played on the Disney Channel television series "Hannah Montana". The song was written by Kara DioGuardi, in collaboration with Daniel James, and produced by Dreamlab. "Supergirl" was released on August 28, 2009, by Walt Disney Records as the lead and only single from the series' third soundtrack, "Hannah Montana 3". A karaoke version is available in "Disney's Karaoke Series: Hannah Montana 3". The song is characterized by dance-pop elements in its musical composition and contains lyrics regarding the lows of pop stardom.
Document 12: Miley Cyrus: Cyrus auditioned for the Disney Channel television series Hannah Montana when she was eleven years old. She auditioned for the role of the title character's best friend, but was called to audition for the lead role instead. Despite being denied the part at first because she was too ``young and small ''for the role, she was selected later as the lead because of her singing and acting abilities. The series premiered in March 2006 to the largest audience for a Disney Channel program, and quickly ranked among the highest - rated series on basic cable. The instant success of the series led to Cyrus being labeled a`` teen idol''. She toured with The Cheetah Girls as Hannah Montana in September 2006, performing songs from the show's first season. Walt Disney Records released a soundtrack credited to Cyrus' character in October of that year. The record was a commercial success, topping the Billboard 200 chart in the United States; it went on to sell over three million copies worldwide. With the release of the soundtrack, Cyrus became the first act within The Walt Disney Company to have deals in television, film, consumer products, and music. She had a two - year relationship with actor Tyler Posey. Cyrus has stated that she dated singer and actor Nick Jonas from June 2006 to December 2007, claiming they were ``in love ''and began dating soon after they first met. Her relationship with Jonas, as well as her`` spoofing'' fellow Disney alums Selena Gomez and Demi Lovato, attracted considerable media attention. Cyrus came out as pansexual to her mother when she was 14, and has said: ``I never want to label myself! I am ready to love anyone that loves me for who I am! I am open. ''
Document 13: Hannah Montana Forever: Hannah Montana Forever is the soundtrack album for the fourth and final season of the television series "Hannah Montana", released on October 15, 2010 by Walt Disney Records. All eleven tracks are performed by its primary actress Miley Cyrus, and are credited to her character Hannah Montana. Recording artists Billy Ray Cyrus, Iyaz, and Sheryl Crow appear as featured vocalists. The soundtrack is primarily a pop record, which sees additional influences from teen pop, pop rock, power pop, dance-pop, and country pop musical styles.
Document 14: Ice Cream Freeze (Let's Chill): "Ice Cream Freeze (Let's Chill)" is a pop song by American recording artist and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she played on the Disney Channel television series "Hannah Montana". The song was written by Matthew Gerrard and Robbie Nevil and produced by Gerrard. It was released on June 30, 2009, by Walt Disney Records as a promotional single from the series' third soundtrack, "Hannah Montana 3". A karaoke version is available in "Disney's Karaoke Series: Hannah Montana 3". It is an instructional dance song with a country pop sound and lyrics referencing ice cream and other frozen treats.
Document 15: I Got Nerve: "I Got Nerve" is a pop song by American recording artist and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart, a character she plays on the Disney Channel television series "Hannah Montana". "If We Were a Movie" was written and produced by Jennie Lurie, Ken Hauptman, and Aruna Abrams, and was produced by Antonina Armato and Tim James. The song was released to Radio Disney as promotion for the series and its first soundtrack, "Hannah Montana". The song has teen pop influences.
ground_truth: eleven years old
sub_queries: Supergirl >> performer Answer: Miley Cyrus
what age did Miley Cyrus start hannah montana Answer: eleven years old