The oldest Kardashian sister is Kourtney Kardashian. Born April 18, 1979 in Los Angeles, California, she is the firstborn child of Kris Jenner and Robert Kardashian. This makes her older than her sisters Kim (born 1980), Khloé (born 1984), and Kylie (born 1997), as well as her half-sisters from her mother’s later relationships. As the eldest sister, Kourtney has often taken on a leadership role within the family’s public narrative and business ventures. The following profile clarifies her birth details, generational position, and notable life milestones with factual context.
Birth Date and Sibling Order
Kourtney Kardashian’s birth date is April 18, 1979. Her chronological birth order among her full sisters is as follows:
| Sister | Birth Date | Notes |
|---|---|---|
| Kourtney Kardashian | April 18, 1979 | Oldest full sister |
| Kim Kardashian | October 21, 1980 | Full sister |
| Khloé Kardashian | June 27, 1984 | Full sister |
| Kylie Jenner | August 10, 1997 | Full sister |
Sources for birth dates include publicly filed legal documents and multiple verified media biographies. Kourtney is consistently identified as the eldest among her sisters in family records and interviews.
Family Structure and Half-Siblings
While Kourtney is the oldest full sister, the Kardashian-Jenner family includes older half-siblings from Kris Jenner’s first marriage to Robert Kardashian. Those half-siblings—Kourtney, Kim, Khloé, and Kylie—are older than Kendall and Kylie Jenner’s younger half-siblings from Kris’s marriage to Caitlyn Jenner. Within the cohort of sisters who share both parents, Kourtney remains the oldest.
Career and Public Presence
Kourtney first gained widespread public attention through the reality television series Keeping Up with the Kardashians, which debuted in 2007. Over the series’ run, she became known for her roles in family-led businesses and her focus on lifestyle and wellness. Notable ventures include:
- DASH store concept and later DASH Miami
- Portobello Ranch, a family property in California
- Kourtney Kardashian Beauty, a skin-care line
- Lazin Tea, a wellness-focused brand
Her television presence shaped the family’s brand long before the rise of targeted social media campaigns, establishing her as a durable figure in popular culture.
Relationship and Family Roles
Kourtney has often been positioned as a stabilizing, nurturing presence in family dynamics and in media portrayals. Key relationship and family milestones include:
- Marriage to Scott Disick in 2014 and subsequent long-term co-parenting following their 2021 separation
- Birth of her children: Mason (2009), Penelope (2012), and Reign (2015)
- High-profile relationship with Travis Barker beginning in 2021, followed by marriage in 2022
These milestones are widely reported in credible media and have contributed to her recognizable public persona.
Net Worth and Business Context
Kourtney’s net worth is frequently discussed alongside her sisters’ financial profiles. While estimates vary across sources, reported figures place her net worth in the hundreds of millions of dollars, supported by business ventures, television income, and endorsements. For comparison within the family, the profile below outlines approximate ranges discussed in publicly available sources:
| Sister | Reported Net Worth Range (approx.) | Context |
|---|---|---|
| Kourtney Kardashian | $100M–$160M | Business ventures, TV, endorsements |
| Kim Kardashian | $1B+ | Enterprise brand, high-profile cases |
| Khloé Kardashian | $50M–$80M | Retail, television, fragrance |
| Kylie Jenner | $1B+ (peak reported) | Cosmetics brand, investment activity |
These ranges reflect publicly reported estimates and should be treated as approximate. They are useful for understanding relative scales of wealth generated by reality television, brand building, and entrepreneurship.
Verified Sources and Public Records
Key facts in this profile—most notably birth dates, family relationships, and major career milestones—are documented in multiple reliable sources, including:
- Official biographies and licensed public records
- Statements from the Kardashian-Jenner management or public relations representatives when available
- Credible news organizations with a track record of accurate entertainment reporting
Where figures such as net worth appear, they are drawn from widely cited estimates in reputable financial and entertainment reporting rather than precise audited statements.
Common Misconceptions
Because the Kardashian-Jenner family spans half-siblings and generational gaps, confusion can arise around exact birth order. To clarify:
- Kourtney is the oldest full sister, not the oldest family member overall when counting half-siblings from Kris’s first marriage.
- Kim is not the oldest sister; she is the second-oldest full sister.
- Khloé and Kylie are younger full sisters, with Kylie being the youngest full sister.
These distinctions matter when the question refers specifically to sisters who share both parents.