Who is the oldest Kardashian sister in the past American television series "Keeping Up With the Kardashian's"?

Kourtney Kardashian (b. 1979) is an American media personality, socialite, and model. In 2007, she and her family began starring in the reality television series "Keeping Up with the Kardashians". Its success led to the creation of spin-offs including "Kourtney and Khloe Take Miami" and "Kourtney and Kim Take New York".

Born in Los Angeles, California, to Robert and Kris Kardashian, she has two younger sisters, Kim and Khloe, and a younger brother, Rob. In 1991, her parents got divorced and her mother married Bruce Jenner, a 1976 Summer Olympics decathlon winner. Through their marriage, Kourtney gained stepbrothers Burt, Brandon, and Brody; and half-sisters Kendall and Kylie.

She and her siblings are popular on social media and endorse products such as waist slimming pants, beauty products, Coca-Cola and prescription drugs, for which they are paid (as of 2016) between US$75,000 and US$300,000 per post on Instagram, Facebook, and Twitter, according to CBC Marketplace.