Knocked Up cast ages: How old was the cast then (and now)?

Over 15 years ago, Knocked Up became an unexpected critically acclaimed romantic comedy and a box office hit to boot. The movie comes from writer-director Judd Apatow as his follow-up to the 2005 comedy The 40-Year-Old Virgin starring Steve Carell. As he's known to do, Apatow continued to make stars, or make them even bigger, with the 2007 pregnancy comedy.

Knocked Up, which returns to Netflix on April 17, stars Katherine Heigl as an on-camera entertainment reporter who has a one-night stand with Seth Rogen's slacker stoner, which results in an unplanned pregnancy. Despite previously deciding not to pursue a relationship after their one night together, the pair are now thrust together in a real and serious (but obviously hilarious) way.

Prior to the movie, Rogen hadn't had a starring film role, Rudd played Phoebe's husband on Friends, and Katherine Heigl was scrubbing in at Seattle Grace Hospital. They all gained fame with the 2007 release, but how old were they at the time? We're sharing how old the cast of Knocked Up was at the time of release, how old they are now, and what they have been up to since!

Seth Rogen as Ben Stone

Seth Rogen was born on April 15, 1982, making the Ben Stone actor and Canada native 42 years old as of April 2024. When Knocked Up was released in theaters in June 2007, Rogen was 25 years old. He's about four years younger than his onscreen love interest Katherine Heigl.

After his leading role, Rogen went on to co-wrote and costar in the 2007 teen comedy Superbad. He's also starred in movies like Pineapple Express, Zack and Miri Make a Porno, Observe and Report, Funny People, The Green Hornet, Paul, 50/50, Take This Waltz, The Guilt Trip, This Is the End, Neighbors and its sequel, The Interview, Long Shot, The Fabelmans, Dumb Money, and more. Rogen co-directed This Is the End and The Interview with Evan Goldberg.

The actor has also lent his voice to animated films such as Horton Hears a Who!, Kung Fu Panda, Monsters vs. Aliens, Sausage Party, The Lion King, Chip 'n Dale: Rescue Rangers, The Super Mario Bros. Movie, Teenage Mutant Ninja Turtles: Mutant Mayhem, and the upcoming Despicable Me 4. While he started his career on the small screen in the Apatow titles Freaks and Geeks and Undeclared, he didn't return to TV in a starring capacity until appearing in Hulu's Pam & Tommy and Apple TV+'s Platonic. Prior to these roles, he guest starred in titles like The League, The Mindy Project, Arrested Development, Kroll Show, Future Man, The Boys, and more.

In 2004, Rogen started dating actress and writer Lauren Miller, and the pair later married in October 2011. The couple doesn't have children and have said they don't plan to become parents. Rogen has been nominated for five Emmy Awards and three Golden Globe Awards. Outside of his work in film and television, Rogen also created a cannabis and ceramics brand called Houseplant.

Katherine Heigl as Alison Scott

Katherine Heigl was born on Nov. 24, 1978, making the Alison Scott actress 45 years old as of April 2024. When the movie was released in June 2007, Heigl was 28 years old, which was over three years older than her costar Seth Rogen.

Knocked Up was released while Heigl was still starring in the ABC medical drama series Grey's Anatomy in her Emmy-winning role as Dr. Izzie Stevens. She left the series during its sixth season in 2010. Following the success of the rom-com, Heigl went on to star in a number of big screen hits: 27 Dresses, The Ugly Truth, Killers, Life as We Know It, New Year's Eve, and One for the Money. She's also appeared in movies like The Big Wedding, The Nut Job, Jackie & Ryan, Home Sweet Hell, and Unforgettable.

After beginning her career on the small screen with Roswell and breaking out with Grey's, Heigl returned to television in the short-lived 2014 series State of Affairs and again in the 2017 legal drama Doubt. She later joined the cast of Suits for the show's final season, and most recently, Heigl co-headlined Netflix's romantic drama series Firefly Lane alongside Sarah Chalke.

Heigl met singer-songwriter Josh Kelley in 2005 during the filming of his "Only You" music video, and they later married in December 2007. The pair adopted two daughters: Naleigh (in 2009) and Adalaide (in 2012). Heigl gave birth to their son Joshua in December 2016.

Paul Rudd as Pete

Paul Rudd was born on April 6, 1969, making the actor 55 years old as of April 2024. When Knocked Up was released in theaters in June 2007, Rudd was 38 years old.

Prior to starring in the Apatow-directed movie, he costarred in 2004's Anchorman: The Legend of Ron Burgundy, which was produced by Apatow. After his quotable role as Pete, Rudd starred in the movies Night at the Museum, Over Her Dead Body, Forgetting Sarah Marshall, Role Models, I Love You Man, Dinner for Schmucks, How Do You Know, Our Idiot Brother, Wanderlust, and The Perks of Being a Wallflower. He returned for the 2012 sequel This Is 40 and reprised his role as Pete. Most recently, Rudd has been starring as Ant-Man in the Marvel Cinematic Universe and leading the Ghostbusters reboot series.

On television, Rudd co-created the series Party Down and had memorable guest starring role in Parks and Recreation as Bobby Newport. He has starred in the series Wet Hot American Summer: First Day of Camp, Living with Yourself, The Shrink Next Door, and Only Murders in the Building.

Rudd has been married to Julie Yaeger and the pair have two children: son Jack (born 2006) and daughter Darby (born 2010). The couple live in Rhinebeck, New York, where they are also co-owners of Samuel's Sweet Shop along with friends and fellow actors Jeffrey Dean Morgan and Hilarie Burton Morgan.

Leslie Mann as Debbie

Leslie Mann was born on March 26, 1972, which makes the actress 52 years old as of April 2024. She's a few years younger than her onscreen husband Paul Rudd. When the movie was released in June 2007, Mann was 35 years old.

After starring in the rom-com directed by her real life husband, Mann starred in movies like 17 Again, Fully People, I Love You Phillip Morris, Rio, Little Birds, The Change-Up, ParaNorman, This Is 40, The Bling Ring, Mr. Peabody & Sherman, The Other Women, Vacation, How to Be Single, Blockers, Welcome to Marwen, Cha Cha Real Smooth, and The Bubble. She hasn't appeared on television much, though she had a memorable guest role in a 2011 episode of Modern Family.

Leslie Mann and Judd Apatow have been married since June 1997. They met while Mann was auditioning for the Jim Carrey movie The Cable Guy, which was produced by Apatow. Together, they have two daughters, Maude Apatow (born 1997) and Iris Apatow (born 2002). Both of their daughters are actresses and appeared as Mann's onscreen daughters in Knocked Up, Funny People, and This Is 40. Maude went on to star in HBO's Euphoria and make her stage debut in Little Shop of Horrors, while Iris appeared in her dad's movie The Bubble, his show Love, and the Netflix comedy Unstable.