Stockard Channing and John Travolta
There are still some issues with the narrative despite the fact that we have no idea how any of the characters in the iconic film Grease could pass as high school students. The powerful actors in the movie that came out in 1978 were only a few years younger than the roles they played.
Both Stockard Channing and John Travolta have gone through significant transformations when they were both still in high school (she is ten years older). It is difficult to believe that a woman who is 33 years old was able to play a teenage girl in such a convincing manner on screen.