Yes, we hate to break it to you, but the movie that will forever symbolize youth and coolness is officially middle aged this year.
While we still find the teen romance electrifyin', we wondered what the cast was up to after all these years. Here's what we found:
John Travolta - Danny
While he's not the only successful cast member from the movie, you're probably most familiar with Travolta's career after Grease. He's starred in a long list of hit films, including Pulp Fiction and Get Shorty, and even played Robert Shapiro on the TV show The People Versus O.J. Simpson.
After 40 years, Travolta's career shows no signs of slowing down.
Jeff Conaway - Kenickie
Sadly, Conaway is one of the three actors on this list who have passed away since their role in Grease. He was a regular actor on Taxi, Wizards and Warriors, The Bold and the Beautiful, and Babylon 5 after Grease.
Conaway died after catching pneumonia in 2011.
Barry Pearl - Doody
If you remember Doody, it's probably for the scene where he mooned the audience. Pearl (along with Travolta) was one of the original actors from the stage version of Grease.
He went on to have parts on Baywatch, House, and Criminal Minds, and also appeared on Fox's Grease: Live show.
Stockard Channing - Rizzo
At 33 years old, Channing was the oldest "teenager" in the cast, and she also had one of the most successful post-Grease careers.
Channing was Oscar-nominated for Six Degrees of Seperation, and had regular roles on The West Wing and The Good Wife. Channing is still acting today, but mainly on Broadway.
Lorenzo Lamas - Tom Chisum
Lamas made an impression with his small role as a football player who had eyes for Sandy. He continued his career with roles on TV shows like Falcon Crest, The Bold and the Beautiful, and Renegade. Lately he's been doing voice work, including on Disney's Phineas and Ferb.
Susan Buckner - Patty Simcox
Buckner's part as the geeky blonde with the cat eye glasses turned out to be her most famous role. She had small parts on shows like The Love Boat, but hasn't been in a movie since 1981.
Michael Tucci - Sonny
After Grease, this T-Bird appeared on shows like The Paper Chase, It's Gary Shandling's Show, and Diagnosis: Murder. But his career is still going strong, with a new movie role this year.
Jamie Donnelly - Jan
This Pink Lady has changed her signature look over the years, but she's never stopped acting. You can see her in movies like Can't Hardly Wait, Cyrus, and the Johnny Depp gangster movie Black Mass.