You might have been led to think that Myrtle spend her time shrieking in the Hogwarts shitters because she was murdered by Voldemort's giant pet snake, but it might also have been due to the fact that she was 37-years-old and still at school.
Yep, you read that right, Shirley Henderson the actor who played the ghostly toilet dweller was 37 when she made her first appearance in Chamber of Secrets and a staggering 41 when she gave a bathing Harry a helping hand in Goblet Of Fire:
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As you may have guessed, that makes the 5' 0½' tall stage star by far the oldest person to portray a teenage Hogwarts student. The Shakespearean stage actress was chosen for the role thanks to her child-like voice, small stature and award-winning acting skills. Although she was clearly a great choice for the small but significant role, I personally was blown away to learn that she was even less of a student than the cast of Dawson's Creek.
Oh, and if you're wondering where you've seen her before, Henderson also appeared in Doctor Who as Ursula Blake alongside the tenth Doctor, though by far her most famous early role was as Gail in the hard-hitting Trainspotting.
From heroin to Hogwarts, eh? What a journey!
Can you think of an even older actor who played a teenager?