How 'Grease' made its stars look like teens (or at least tried)

In the movie 'Grease', which actor was the oldest 'teenager'? Were any of them really teenagers when it was made? - Quora

Actresses Over 50 Who Are More Successful Now Than Ever – SheKnows

Adam Sandler Originally Imagined Leo as an Elementary School Grease – The Hollywood Reporter

Cookie Monster Cake (for Decorating Beginners) - Sally's Baking Addiction

In Grease (1978), the hickeys on Rizzo's neck were real. They were actually created by Jeff Conaway, who insisted that the ”hickey from Kenickie” had to come from him. : r/MovieDetails

Olivia Newton-John Dead: 'Grease' Star And Hitmaking 'Physical' Singer Was 73 – Deadline