Question: Life of Kylie is an American reality television series starring Kylie Jenner,  best known for starring in the E! reality television series "Keeping Up with the Kardashians" since what young age?

Context articles: Kourtney and Kim Take Miami
Keeping Up with the Kardashians
Kim Kardashian
Kendall Jenner
Khloé &amp; Lamar
List of Keeping Up with the Kardashians episodes
Life of Kylie
Kylie Jenner
Kris Jenner
Dash Dolls

Kourtney and Kim Take Miami (previously titled Kourtney and Khloé Take Miami) is an American reality television series.
 It premiered on E! on August 16, 2009, as the first "Keeping Up with the Kardashians" spin-off.
 The series originally followed sisters Kourtney and Khloé Kardashian as they opened a second D-A-S-H location in Miami, Florida.
 From the third season onward, sister Kim Kardashian replaced Khloé, who had other work commitments.
 The third season began filming in October 2012, and premiered on January 20, 2013.
Keeping Up with the Kardashians (often abbreviated KUWTK) is an American reality television series that airs on the E! cable network.
 The show focuses on the personal and professional lives of the Kardashian–Jenner blended family.
 Its premise originated with Ryan Seacrest, who also serves as an executive producer.
 The series debuted on October 14, 2007 and has subsequently become one of the longest-running reality television series in the country.
 The fourteenth season of the series will premiere on October 1, 2017.
Kimberly Kardashian West (born Kimberly Noel Kardashian; October 21, 1980) is an American reality television personality, socialite, actress, businesswoman and model.
 Kardashian first gained media attention as a friend and stylist of Paris Hilton, but received wider notice after a 2003 sex tape with her former boyfriend Ray J was leaked in 2007.
 Later that year, she and her family began to appear in the E! reality television series "Keeping Up with the Kardashians".
 Its success soon led to the creation of spin-offs including "Kourtney and Kim Take New York" and "Kourtney and Khloé Take Miami".
 Kardashian's personal life soon became subject to widespread media attention.
Kendall Nicole Jenner (born November 3, 1995) is an American fashion model and television personality.
 Originally known for appearing in the E! reality television show "Keeping Up with the Kardashians", Jenner is now also a model in a movement dubbed "the Instagirl era" by "Vogue" magazine, or "Social Media Modeling" by "Harper's Bazaar", where models are chosen for their online presence and social media following.
Khloé & Lamar is an American reality television series that debuted on E! in the United States and Canada on April 10, 2011.
 The series is the third spin-off of the show "Keeping Up with the Kardashians" and features reality star Khloé Kardashian and her then-husband, basketball player Lamar Odom.
 The series returned for its second and final season on February 19, 2012.
"Keeping Up with the Kardashians" is an American reality television series that has aired on E! since October 14, 2007.
 The series has aired thirteen seasons, and focuses on the personal and professional lives of the Kardashian–Jenner family.
 Its premise was originated with Ryan Seacrest, who additionally serves as an executive producer.
 The series focuses on sisters Kourtney, Kim, and Khloé Kardashian.
Life of Kylie (LOK) is an American reality television series starring Kylie Jenner.
 The eight-part half-hour series premiered on August 6, 2017, on the E! cable network.
 The reality series was greenlit on April 10, 2017.
 On May 11, 2017, E! released the first promo video of the series.
Kylie Kristen Jenner (born August 10, 1997) is an American reality television personality, model, entrepreneur, socialite, and social media personality.
 She is best known for starring in the E! reality television series "Keeping Up with the Kardashians" since age nine, her eponymous brand of cosmetics, and her large social media presence.
Kristen Mary Jenner ("née" Houghton, , formerly Kardashian; born November 5, 1955) is an American television personality who rose to fame for starring in the reality television series "Keeping Up with the Kardashians", together with her family.
Dash Dolls is an American reality television series that premiered on the E! cable network, on September 20, 2015.
 The show is a spin-off of "Keeping Up with the Kardashians".
 The series features a group of young female employees, referred to as Dash Dolls, working in the Dash boutique in Hollywood which is owned by the Kardashian sisters.