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

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

Kerry Fox: 'I still see myself as a teen: pot, joyriding and trying to have sex', Movies

Grease' cast: Where are they now?

Olivia Newton-John and the Grease casting choices we almost got to see

When Grease was originally released, did people comment at the time that the cast looked too old to be playing teenagers? - Quora

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Grease : Didi Conn, Frankie Avalon, Jeff Conaway, John Travolta, Olivia Newton-John, Stockard Channing, Randal Kleiser: Movies & TV

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

Mean Girls' 10-year anniversary: Damian, Gretchen, more look back

How to Look Like a Greaser: 10 Steps (with Pictures) - wikiHow