Which Kardashian sister is the oldest?

Kourtney Kardashian is the oldest of the Kardashian sisters.

Kourtney Mary Kardashian was born on April 18, 1979, in Los Angeles, California. She is the first child of Robert Kardashian and Kris Jenner. Her younger full siblings are Kim Kardashian, Khloé Kardashian and Rob Kardashian.

Kourtney’s place in the family is distinct from Kris Jenner’s older daughters from her later marriage to Caitlyn Jenner. Kendall and Kylie Jenner are Kourtney’s younger maternal half-sisters. This blended-family structure is why questions about the “oldest sister” can be ambiguous unless they specify the Kardashian sisters or the whole Kardashian-Jenner family.

Kourtney became widely known through Keeping Up with the Kardashians and later appeared in several family spin-offs. She also founded the lifestyle company Poosh. Her three oldest children are with Scott Disick, and she later married musician Travis Barker.