Liam Costner is the fourth child of Oscar-winning actor Kevin Costner, and he is one of the most private members of the famous family. Fans often see Kevin’s other children at premieres and in family photos, but Liam almost never appears in public. Because of this, many people search for simple facts about him, such as his age, his mother, and his job. This article shares what trusted news sources say about Liam, and it also tells you clearly what is still unknown.
Quick Bio Of Liam Costner
| Detail | Information |
|---|---|
| Full name | Liam Timothy Costner (reported) |
| Birth date | November 15, 1996 (reported) |
| Age | 29 years old (as of October 2026) |
| Father | Kevin Costner, actor, director, and musician |
| Mother | Bridget Rooney |
| Birth order | Fourth of Kevin Costner’s seven children |
| Siblings | Six half-siblings: Annie, Lily, Joe, Cayden, Hayes, and Grace |
| Mother’s family | The Rooney family, linked to the Pittsburgh Steelers |
| Public profile | Very low, rarely seen in the media |
| Job | Not shared publicly |
Who Is Liam Costner?
Liam Costner is the fourth of Kevin Costner’s seven children, and he is the only child Kevin has with Bridget Rooney. Kevin’s first three children, Annie, Lily, and Joe, were born during his marriage to Cindy Silva. That marriage ended in 1994. About two years later, in November 1996, Liam was born during a short relationship between Kevin and Bridget.
Kevin later married Christine Baumgartner, and they had three more children. Liam did not grow up in front of the cameras like some other famous kids. Reports say both he and his mother have stayed away from the spotlight since he was born. As a result, there are very few interviews or public statements from Liam himself. Most facts about him come from articles about his father.
Who Are Liam Costner’s Parents?
Liam’s father is Kevin Costner, a well-known American actor, director, and musician, and his mother is Bridget Rooney.
Kevin was born on January 18, 1955, in California. He became a household name in 1987 with the films The Untouchables and No Way Out. He later won Oscars for best director and best picture for Dances With Wolves. In recent years, many people know him as John Dutton on the TV show Yellowstone, a role that earned him a Golden Globe in 2023.
Bridget Rooney comes from the Rooney family, which is closely tied to the Pittsburgh Steelers football team. People magazine describes her as the niece of Dan Rooney, the longtime Steelers owner who died in 2017. Other outlets describe her exact family link in slightly different ways, but they all point to the same famous football family. Reports also say she married billionaire William Koch in 2005. Like her son, Bridget has kept out of the public eye.
How Old Is Liam Costner?
Liam Costner is 29 years old as of October 2026. Reports list his birthday as November 15, 1996, so he will turn 30 next month.
You may see different ages in older articles. For example, some 2023 stories say he was 26, and some 2024 stories say he was 28. Those numbers were correct on the day the article was published. Always check the date of an article before you trust an age.
Who Are Liam Costner’s Siblings?
Liam has six half-siblings through his father, and they come from two different families.
From Kevin’s first marriage to Cindy Silva:
- Annie Costner, born April 15, 1984
- Lily Costner, born August 4, 1986
- Joe Costner, born January 31, 1988
From Kevin’s marriage to Christine Baumgartner:
- Cayden Wyatt Costner, born May 6, 2007
- Hayes Logan Costner, born February 12, 2009
- Grace Avery Costner, born June 2, 2010
Joe is the closest to Liam in age, and he is about eight years older. The three youngest children are much younger, so Liam is also much older than they are. Some of his siblings have joined their father at work. Kevin cast his son Hayes in the movie Horizon: An American Saga, and he has also said that his oldest son, Joe, had a small part in the second chapter. One news outlet reports that Kevin has good relationships with all seven of his children.
Why Does Liam Costner Stay Out of the Spotlight?
No trusted source explains why Liam stays out of the spotlight, but several reports confirm that he does. In May 2024, Kevin walked the red carpet at the Cannes Film Festival with five of his children. News reports noted that Joe and Liam were not there. In a Thanksgiving post on Instagram in late 2024, Kevin shared photos with several of his children, and the reports said Liam was not pictured.
It is important not to read too much into this. A missing photo does not tell us anything about a person’s family ties. One People report, based on an unnamed source, said that Kevin set up a trust fund for Liam and saw him “occasionally but not on a regular basis.” Neither Kevin nor Liam has confirmed this, so you should treat it carefully.
Many adult children of famous people choose a quiet life, and that is their right. Liam has never asked for fame, so the fair way to write about him is to stick to confirmed facts.
What Does Liam Costner Do for a Living?
No reliable source has shared Liam Costner’s job, school, or home city. He does not appear in major news stories as an actor, a singer, or a business owner. Some websites claim to show his social media pages, his career, or his net worth, but these claims are usually guesses. Unless Liam himself or a major news outlet confirms a detail, it is best to treat it as a rumor.
What Is the Timeline of Liam Costner’s Family?
Liam’s story is closely connected to key moments in his father’s life. Here is a simple timeline from trusted reports.
- 1994: Kevin Costner and Cindy Silva divorce.
- November 15, 1996: Liam is born to Kevin and Bridget Rooney.
- 1998: Kevin meets Christine Baumgartner again at a restaurant, and they start dating.
- 2004: Kevin marries Christine Baumgartner in Aspen, Colorado.
- 2005: Bridget Rooney reportedly marries William Koch.
- 2007 to 2010: Kevin and Christine welcome Cayden, Hayes, and Grace.
- 2023: Christine Baumgartner files for divorce after 18 years of marriage.
Conclusion
Liam Costner is Kevin Costner’s fourth child, born in November 1996 to Bridget Rooney, and he has chosen to live away from the spotlight. We know his age, his parents, and his half-siblings, but we do not know his job or daily life. Until Liam shares more, the best approach is to rely on confirmed facts and respect his privacy.
Frequently Asked Questions
Who is Liam Costner?
Liam Costner is the fourth child of actor Kevin Costner. His mother is Bridget Rooney, who comes from the Rooney family linked to the Pittsburgh Steelers. He was born in November 1996 and, according to reports, has kept a very private life away from cameras and red carpets.
How old is Liam Costner?
Liam Costner is 29 years old as of October 2026. Reports list his birthday as November 15, 1996, so he turns 30 next month. Older articles show different ages because they were written in earlier years, so always check the publication date before you trust an age.
Is Liam Costner an actor?
No trusted source says Liam Costner works as an actor. His half-brother Hayes appeared in Horizon: An American Saga, and Kevin has said another son, Joe, had a small part in the second chapter. Liam’s own job has not been shared in any major report.
Who is Liam Costner’s mother?
Liam’s mother is Bridget Rooney. People magazine describes her as the niece of Dan Rooney, the longtime Pittsburgh Steelers owner who died in 2017. Reports say she married billionaire William Koch in 2005. Like her son, she has stayed out of the public eye.
How many siblings does Liam Costner have?
Liam Costner has six half-siblings. Annie, Lily, and Joe are children of Kevin Costner and his first wife, Cindy Silva. Cayden, Hayes, and Grace are children of Kevin and his second wife, Christine Baumgartner. Liam is the only child Kevin has with Bridget Rooney.
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