Emma Watson was born on April 15, 1990. That makes her a fresh-faced 15 years old when filming for Order of the Phoenix started in early 2006. Wait, hold on—filming wrapped in late 2006. So she turned 16 during production.
That’s right. She was a teenager through and through. Think about that when you see her facing off against Dolores Umbridge. She’s literally the same age as your average grumpy sophomore.
The Hogwarts Timeline Twist
Now, here’s where it gets goofy. In the books, Hermione Granger is a year older than the golden trio’s core? No, actually, she’s the same age as Harry and Ron—they’re all born in 1979–1980. But in the Order of the Phoenix story, Hermione is 15 and then turns 16 around the book’s end. Emma was 15–16 during filming. Perfect alignment.
That’s a rare win for child actors. Most of them are playing kids way younger or older. Emma got to be exactly her character’s age.