This week, the Internet caught fire with the unveiling of How Old Do I Look? (found at How-Old.net), a new tool from Microsoft that tells you exactly what its name promises, as well as your gender. Just upload a photo of your face, and voila! Your whole day is ruined.

Hollywood is notorious for taking liberties with the ages of its actors, particularly when finding talent to play teenagers. The only way the cast of Grease could have plausibly attended Rydell High School is if every single student had been held back for about a decade.

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But we were pleasantly surprised to discover that #HowOldRobot will not be seduced by show business smoke and mirrors. If anything, How-Old.net guesses that the overgrown high schoolers we see on screen are even older than they actually are — with the notable exception of perma-teen actress Bianca Lawson, who has been mathematically confirmed to be aging in reverse.

Alan Ruck as Cameron in Ferris Bueller's Day Off

Real age: 30
Character's age: 18
#HowOldRobot age: 27

how-old.net

Stockard Channing as Rizzo in Grease

Real age: 33
Character's age: 18
#HowOldRobot age: 34

how-old.net

Michael J. Fox as Marty McFly in Back to the Future

Real age: 24
Character's age: 17
#HowOldRobot age: 41

how-old.net

Jennifer Grey as Jeanie in Ferris Bueller's Day Off

Real age: 26
Character's age: 16
#HowOldRobot age: 32

how-old.net

Tobey Maguire as Peter Parker in Spider-Man

Real age: 27
Character's age: 18
#HowOldRobot age: 27

how-old.net

Gabrielle Carteris as Andrea in Beverly Hills90210

Real age: 29
Character's age: 16
#HowOldRobot age: 41

how-old.net

Rachel McAdams as Regina George in Mean Girls

Real age: 25
Character's age: 16
#HowOldRobot age: 29

how-old.net

Henry Winkler as Fonzie in Happy Days

Real age: 29
Character's age: 19
#HowOldRobot age: 38

how-old.net

Bianca Lawson as Megan in Saved by the Bell: The New Class

Real age: 14
Character's age: 14
#HowOldRobot age: 35

how-old.net

Bianca Lawson as Kendra in Buffy the Vampire Slayer

Real age: 18
Character's age: Late teens
#HowOldRobot age: 27

how-old.net

Bianca Lawson as Maya in Pretty Little Liars

Real age: 33
Character's age: 17
#HowOldRobot age: 22

how-old.net

Molly Fitzpatrick is senior editor of Fusion's Pop & Culture section. Her interests include movies about movies, TV shows about TV shows, and movies about TV shows, but not so much TV shows about movies.

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