Shirley Henderson was 37 when she played 14-year-old Moaning Myrtle โ€” and 40 when she last played the role. Y'know, of a literal child.

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NOTE: Some of these ages may be slightly off (but within the year), as we're relying on filming dates from Wikipedia and IMDB. If we used movie release dates, most of these gaps would be even more severe!ย 

*This article states he was 30, though if the film's Wikipedia is correct, filming would've begun when he was newly 31.