American actor Douglas Bourne AKA "Doug E. Doug" was in his early 20s when he was cast to play Sanka -- the push cart racing, egg-kissing champion who's funny, loud and laid back -- in the 1993 feel-good sports film "Cool Runnings."

Bourne shared the big screen with John Candy as the former Olympic bobsledder (disqualified for cheating), Irv, Leon Robinson as the motivated, determined to make it to the Olympics dude, Derice and Rawle D. Lewis as the bobsledder who feels pressure from his father, Junior.

Douglas also played Griffin Vesey on CBS's sitcom show, "Cosby."

American actress Lindsay Wagner was in her mid-20s when she first started playing Jaime -- the cyber-strengthened and former tennis player who uses her speed and super hearing skills to carry out spy missions -- in the classic '70s television show "The Bionic Woman."

Joining Lindsay on set included Martin E. Brooks as one of Jaime's doctors who created bionic people, Dr. Rudy Wells, Richard Anderson as the Office of Scientific Intelligence boss, Oscar Goldman, and Jennifer Darling as Dr. Goldman's smart secretary, Peggy Callahan.

Wagner first played this iconic role on "The Six Million Dollar Man" -- also in the '70s.

American actor Alexander Gould was just a pre-teen when he first started playing Shane -- the youngest son of Nancy who is intelligent and quick-witted -- on the long-running pot program "Weeds" back in 2005.

Alex was part of an ensemble cast including Mary-Louise Parker as the widowed mom and former housewife turned drug dealer, Nancy, Andy Milder as the lawyer who smokes a lot of weed and loves his daughter, Dean, Justin Kirk as the fun and childish dude serving in the army reserve, Andy.

Fun fact: Gould portrayed the voice of Nemo in "Finding Nemo!"

American singer-songwriter Greyson Chance was only 12 years old when he rose to superstardom with his 2010 performance of Lady Gaga's "Paparazzi" -- gaining a whopping 72+ million views on YouTube.

The viral star was quickly signed with Ellen DeGeneres' record label, eleveneleven -- and released his debut single "Waiting Outside the Lines" that same year. In 2011, his debut studio album "Hold On 'til the Night" dropped and peaked at number 29 on the Billboard 200.

Fun fact: Ariana Grande was heavily featured in his "Unfriend You" music video.

Taiwanese-American actor Mason Lee was at the prime age of 21 years old when he was cast to play Teddy -- the studious little brother who gets lost and loses a finger while on a wild bender in Bangkok -- in the 2011 follow-up film "The Hangover Part II."

Joining Lee in the silly shenanigans included Zach Galifianakis as the childish adult who shows a growing sense of maturity since the prequel, Alan, Ed Helms as the dentist grappling with his hangover from the night of partying, Stu and Bradley Cooper as the studly leader of "The Wolfpack," Phil.

American actor Shane West was in his early 20s when he was cast to play Landon -- the high school heartthrob who transforms from immature to compassionate -- in the 2002 rom-com classic "A Walk To Remember."

Sharing the big screen with West included Mandy Moore as the loyal, kind and religious high school gal with cancer, Jamie, Lauren German as Jamie's protective and supportive bestie, Belinda, and Peter Coyote as Jamie's strict father and prime minister, Reverend Sullivan.

Landon contributed to the "A Walk To Remember" soundtrack, and today he's a band member of the Twilight Creeps.

Japanese actress and singer Chiaki Kuriyama was just 18 years old when she was cast to play Gogo Yubari -- the 17-year-old bodyguard protecting Lucy Liu's character "Cottonmouth" -- in Quentin Tarantino's 2003 masterpiece "Kill Bill: Vol. 1."

Chiaki shared the big screen with Uma Thurman as the highly skilled martial artist and the callous assassin training under Pai Mei, The Bride, Lucy Liu as the "Queen of the Tokyo Underworld," O-Ren Ishii AKA Cottonmouth, and David Carradine as the calm leader of the Deadly Viper Assassination Squad, Bill.

She also played Yuko Mizushima in Sion Sono's 2007 movie "Exte."

American actress Liliana Mumy was only 9 years old when she first played Jessica Baker -- the intelligent twin sister who loves algebra and holds hands with her siblings Kim and Mark on the first day of school -- in the 2003 family/comedy film "Cheaper By The Dozen."

Mumy shared the big screen with Hollywood greats like Steve Martin as the funny dad and football coach, Tom Baker, Bonnie Hunt as the loving mother, Kate Baker and Hilary Duff as Jessica's older sister, who is into makeup and fashion, Lorraine Baker.

Liliana reprised her role for the sequel, "Cheaper by the Dozen 2" in 2005.

American actress Ele Keats was only 18 years old when she was cast to play Sarah -- the caring and naive sister who attracts Christian Bale's character, Jack Kelly, -- in the family musical "Newsies" back in 1992.

Ele shared the big screen with Christian Bale as the orphaned newsboy who inspires his fellow newsboys to fight for higher wages, Jack, David Moscow as the smart and persuasive newsboy, David, and Gabriel Damon who takes on a leadership role with his fellow newsboys, Spot.

Keats was also in the 1991 rom-com "Frankie and Johnny" -- playing Artemis.

Irish dance pop-girl group B*Witched -- made up of twin sisters Edele and Keavy Lynch ... and Lindsay Armaou and Sinéad O'Carroll -- shot to superstardom in the late '90s with songs like "C'est la Vie," "Rollercoaster" and "To You I Belong."

In addition to their songs reaching number one on the UK singles chart, their catchy tunes also thrived here in the States.

The ladies performed all over the world from 1997-2002 ... and reunited in 2013 for the ITV2 reality-documentary series "The Big Reunion."

"Say you will, say you won't, say you'll do what I don't, say you're true, say to me (say you will) ... C'est la vie!"

Chinese actor Zhenwei Wang was only 14 years old when he played Cheng -- one of Master Li's skilled marital arts students who hands the trophy over to Dre during the final match -- in the 2010 family/action film "The Karate Kid."

Joining Zhenwei on the big screen included Jaden Smith as the bullied teenager transitioning to a disciplined martial artist, Dre, Jackie Chan as Dre's Kung Fu mentor who also provides life lessons, Mr. Han, and Luke Carberry as the nice and friendly kid, Harry.

Wang has performed stunts for other movies like "12 Hours" and "Shang-Chi and the Legend of the Ten Rings."

American actress Jashaun St. John was just a teenager when she rose to fame playing Blue -- the sensitive and quiet girl from New Mexico, traveling with her bestie -- in the 2015 adventure/drama film "The Short History Of The Long Road."

Jashaun shared the big screen with Sabrina Carpenter as the self-sufficient teen who lives in a van, searching for her mother, Nola, Steven Ogg as Nola's penny-pinching father who dies, Clint, and Danny Trejo as the mechanic shop owner who takes Nola under his wing, Miguel.

In 2021, St. John was in Marvel's "Eternals" with Angelina Jolie.

American actor and model Greg Sestero was in his mid-20s when he played the role of Mark -- the promiscuous friend who enjoys passing the football and also cheats with Lisa -- in the 2003 cult classic, "The Room."

Greg shared the big screen with Tommy Wiseau as the socially awkward dude and Lisa's fiancé, Johnny, Juliette Danielle whose sheltered life leaves her making poor choices, Lisa and Carolyn Minnott as Lisa's manipulative mother, Claudette.

When Mark was a junior in high school, he started modeling -- working in Paris and Milan for big designers like Giorgio Armani.

American musician and songwriter Morris Day -- and the funky frontman for the Minnesota music consortium, The Time -- was in his mid-20s when he shot to stardom with jams like "Jungle Love" in the '80s.

His charting single "Fishnet" reached number 23 on the Hot 100 chart, and with his popular bops, Day dabbled on the big screen -- playing himself in Prince's 1984 movie "Purple Rain" and "Graffiti Bridge" (1990).

As far as TV acting roles -- he was on NBC's sitcom series "227" with Marla Gibbs and ABC's "New Attitude" with Sheryl Lee Ralph.

American actress Wendy Schaal was in her mid-30s when she played Bonnie Rumsfield -- the blonde trophy wife who finds the neighbor's dog -- in the 1989 funny film "The 'Burbs."

Wendy shared the big screen with legendary actor Tom Hanks as the paranoid man who attempts to be logical, Ray, Bruce Dern as the veteran who is jealous of his neighbor's lawn, Mark, and Corey Feldman as the neighborhood's tacky neighbor who stirs up trouble, Ricky.

Wendy was in other Joe Dante (director) films like "Innerspace" and "Small Soldiers."