Susanna Kaysen / Winona Ryder
Winona Ryder was cast as 18-year-old Susanna Kaysen in Girl, Interrupted, while the actress was actually 28 years of age. Ryder says, in an interview, that if she had seen this movie at the age of 19, she would’ve taken a lot of comfort in it, as it tackles a lot of mental health issues people have to deal with.