Once upon a time, Dennis Quaid and Meg Ryan were married, and though their marriage failed, one good thing did come of it; their son, Jack. Though papa Quaid’s more substantial roles happened later in life, by 27, he had a pretty impressive résumé.
Jack decided to venture into acting as well, and has appeared in films like “The Hunger Games” and was most recently a star in the critically acclaimed show “The Boys.”
Kirk Douglas (30) & Michael Douglas (30)
Both Kirk and Michael Douglas had outstanding acting careers and are considered two of Hollywood's greatest. When Kirk was 30, he landed his first role in the film, "The Strange Love of Martha Ivers," the part that kickstarted his career into what it is today.
When his son, Michael, was the same age, he was busy starring in the show, "The Streets of San Fransisco." Though the two actors were popular in different generations, it's safe to say that they're on the same level of greatness in Tinseltown.
Donald Sutherland (52) & Kiefer Sutherland (52)
Donald Sutherland rose to fame with roles in shows like "Dirty Dozen" and "M.A.S.H" and really hit it big in the film industry for his roles in "Ordinary People" and "1900."
His son (who happens to be a twin) Kiefer rose to fame in the '80s when he took part in the film "The Lost Boys." Keifer won an Emmy, Golden Globes, and two Screen Actors Guild Awards for his starring role as Jack Bauer in the Fox drama series, "24."
John Ritter (29) & Jason Ritter (29)
This million-watt smile isn't the only thing John Ritter passed on to his son, Jason. Papa Ritter is most known for his role in the '70s sitcom "Three's Company," which he started acting in when he was only 28.
His son, Jason, turned to acting just like his father and has been in several television shows and movies by his late 20s. Losing John was hard for fans everywhere, but lucky for us, whenever we miss the late actor, we look at Jason!
Robert Downey Jr. (26) & Indio Falconer Downey (26)
Robert Downey Jr.'s oldest son almost looks like he could be his dad's brother—you know, minus the beard and long hair.
Like his dad, Indio also decided to go into the entertainment business. In 2005, Indio appeared in his father's film "Kiss Kiss Bang Bang," and he's also dabbled in the music industry as a performer in several bands.