Kourtney Kardashian is the oldest of the famous siblings, born on April 18, 1979. As the eldest daughter of Kris Jenner and the late Robert Kardashian, she anchors the top of one of the most recognized family trees in modern media. While her sisters Kim, Khloé, Kendall, and Kylie command massive global footprints, Kourtney held the generational line first, setting the stage for decades of reality television and pop culture dominance.
Understanding the sibling hierarchy goes beyond trivia. It explains family dynamics, business timing, and how the Kardashian brand evolved from a prominent Los Angeles legal household into a multi-industry empire.
The Complete Kardashian-Jenner Birth Order
The family tree spans two distinct eras of parenting by Kris Jenner, resulting in a blended sibling group that often confuses casual viewers. To clear up any confusion, the siblings break down in strict chronological order from oldest to youngest:
- Kourtney Kardashian: Born April 18, 1979. The firstborn child of Kris and Robert Kardashian.
- Kim Kardashian: Born October 21, 1980. The second sibling, known for launching the family's broader commercial reach.
- Khloé Kardashian: Born June 27, 1984. The third sibling born to the original Kardashian marriage.
- Rob Kardashian: Born March 17, 1987. The youngest sibling from the Kris and Robert marriage.
- Kendall Jenner: Born November 3, 1995. The first child of Kris and Caitlyn Jenner (formerly Bruce Jenner).
- Kylie Jenner: Born August 10, 1997. The youngest sibling of the entire modern Kardashian-Jenner household.
This timeline shows an 18-year gap between the birth of Kourtney and the birth of Kylie. That age spread shaped how the sisters grew up, with Kourtney experiencing young adulthood and college years well before her youngest half-sisters entered the public eye.
Kourtney's Role in Early Family Fame
Long before Keeping Up with the Kardashians premiered on E! in 2007, Kourtney was navigating life in Los Angeles. She attended Southern Methodist University before transferring to the University of Arizona, where she graduated with a bachelor's degree in Theater Arts and a minor in Spanish.
When the reality show started, Kourtney's role was often that of the grounded, sharp-tongued skeptic. Her relationship with Scott Disick anchored multiple seasons of drama and spin-offs, including Kourtney and Kim Take Miami and Kourtney and Khloé Take Hamptons.
She was also the first sibling to become a parent, welcoming her son Mason in December 2009. That milestone shifted the dynamic of the show from young socialites partying in Hollywood to a multi-generational family raising children under intense media scrutiny.
Evolution of the Brand and Lifestyle Shift
As the eldest, Kourtney carved out a distinct path away from traditional corporate licensing deals. In 2019, she launched Poosh, a lifestyle and wellness brand focused on clean beauty, interior design, and alternative health practices. This venture reflected her personal lifestyle choices, which often favored organic living and holistic health over heavy fashion campaigns.
Her marriage to musician Travis Barker in 2022 further shifted her public persona, blending rock culture with high-fashion aesthetics. Through these changes, she has maintained her status as the family's senior sibling, often offering a contrasting perspective during family conflicts documented in newer series like The Kardashians on Hulu.
Common Misconceptions About Kardashian Ages
Pop culture internet forums frequently mix up the ages and birth order of the siblings. A few common errors worth clearing up include:
- Assuming Kim is the oldest: Because Kim became the primary media lightning rod and business juggernaut early on, many casual fans assume she is the firstborn.
- Confusing half-siblings with full siblings: The public often views all six women as a single group from one marriage, overlooking the 1991 divorce of Kris and Robert Kardashian and Kris's subsequent marriage to Caitlyn Jenner.
- Misjudging the age gaps: The tight grouping between Kourtney (1979), Kim (1980), and Khloé (1984) created a tight-knit triad of older sisters who experienced childhood and early media exposure together.
Frequently Asked Questions
What is the exact age difference between Kourtney and Kim Kardashian?
Kourtney is roughly 18 months older than Kim. Kourtney was born in April 1979 and Kim followed in October 1980.
Who is the youngest among all the Kardashian and Jenner siblings?
Kylie Jenner is the youngest, born in August 1997. She is more than 18 years younger than Kourtney.
Did Kourtney graduate from college?
Yes. She earned a degree from the University of Arizona in Theater Arts with a minor in Spanish before her family's television career began.
How many children does Kourtney Kardashian have?
She shares three children—Mason, Penelope, and Reign—with her ex-partner Scott Disick, and welcomed a fourth child, Rocky Thirteen, with her husband Travis Barker in November 2023.
