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?
Sentence (from "Kylie Jenner"): 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.
Relevant evidence: Yes