How Old Was Emma Watson in Every Harry Potter Movie

By Mohamed 09/25/2025
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Emma Watson literally grew up in front of the world as Hermione Granger after being cast in the Harry Potter movies as a newcomer. Through the years, she has grown into this graceful young actress who has starred in films like Beauty and the Beast and even shared screen with the likes of Ethan Hawke in Regression

But fans still keep going back to her baby years on the set of Harry Potter, wondering how old she was in each film, because we literally watched her transform from a child star into an inspiring young woman. Well, as it goes, Emma Watson was 10 years old when she began filming Sorcerer’s Stone in 2001. 

Now, since the last Harry Potter film wrapped up in 2011, the franchise covered ten years of her life. So, let’s break down Emma Watson’s age across all eight Harry Potter movies, and check out the age of her book counterpart. 

The table contains the age comparison between Emma Watson and Hermione Granger:

1. Emma Watson Was 10 Years Old in Sorcerer’s Stone 

Hermione in Sorcerer’s Stone Was 11 Years Old

Hermione Granger in Sorcerer’s Stone might have been 11 years old when her name appeared on the Book of Admittance for Hogwarts, but Emma Watson was just 10 when she began filming. This made her slightly younger than her character, as well as her co-stars Daniel Radcliffe, Rupert Grint, and Tom Felton. 




However, despite her young age, Watson delivered a flawless performance as Hermione, capturing her smart, book-loving persona. 

2. Emma Watson Was 11 Years Old in Chamber of Secrets 

Hermione in Chamber of Secrets Was 12 Years Old

In Chris Columbus’ Chambers of Secrets, Watson was only 11 years old when her book counterpart was already 12. But again, despite being a year younger than Hermione, the actress once again proved her skills onscreen with her impeccable performance. 

In this movie, her character grew braver, helping Harry solve the mystery of the Chamber of Secrets. And even though she was petrified, her intelligence guided her friends to the truth.

3. Emma Watson Was 13 Years Old in Prisoner of Azkaban 

Hermione in Prisoner of Azkaban Was 13 Years Old

Alfonso Cuarón’s Prisoner of Azkaban was the first movie where Emma Watson and her character’s age became the same. As the film began its production after a year’s hiatus, Watson’s age caught up to her character. To be exact, Hermione was 13 years old in the story. 

And this movie is where Hermione really began to shine as more than just the clever student. With the Time-Turner, she showed courage, responsibility, and strength, proving she could handle challenges even adults would find impossible.

4. Emma Watson Was 14 Years Old in Goblet of Fire 

Hermione in Goblet of Fire Was 14 Years Old

Mike Newell’s Goblet of Fire became the second movie in the franchise where Watson and Hermione’s ages matched. Both were 14 years old in this movie, which may have helped the actress better understand the sentiments and actions of her character. 

Plus, this movie showed a new side of Hermione, especially during the Yule Ball, where she surprised everyone with her beauty and grace. Her growth into a confident young woman became clear on screen.

5. Emma Watson Was 16 Years Old in Order of the Phoenix 

Hermione in Order of the Phoenix Was 15 Years Old

Considering how Order of the Phoenix began filming after a year’s gap, Emma Watson sadly grew older than her book counterpart. In this storyline, while Hermione was 15 years old, Watson appeared 16, a year older than her character. 




However, that didn’t affect her looks or her performance, even though this movie marked a major turning point, as Hermione became a leader in Dumbledore’s Army. She showed wisdom beyond her years, teaching others and standing firmly against Voldemort’s growing threat at Hogwarts.

6. Emma Watson Was 18 Years Old in Half-Blood Prince 

Hermione in Half-Blood Prince Was 16 Years Old

Yet again, as David Yates’ Half-Blood Prince took a year’s gap before beginning production in 2009, Watson grew into an 18-year-old young adult, while Hermione remained 16 years old, as per the storyline. 

In this movie, Hermione dealt with teenage emotions, especially her feelings for Ron. Yet she also showed her maturity and bravery, helping Harry uncover secrets about Voldemort while staying at the heart of the trio.

7. Emma Watson Was 19 Years Old in Deathly Hallows: Part I 

Hermione in Deathly Hallows: Part I Was 17 Years Old

In the Deathly Hallows storyline, Hermione was a 17-year-old Hogwarts student, whereas Watson grew into a 19-year-old adult, two years older than her character, during the filming of the movie. Yet, she tackled the emotions and maturity of a 17-year-old with utmost grace. 

Hermione in Deathly Hallows: Part I left behind her safe school life to fight evil, alongside Harry and Ron. She was fearless, loyal, and prepared, demonstrating that she had grown from a curious and intelligent witch into a powerful young woman.

8. Emma Watson Was 20 Years Old in Deathly Hallows: Part II 

Hermione in Deathly Hallows: Part II Was 17 Years Old

Given how J.K. Rowling’s last book was divided into two parts, it created a major disparity between Emma Watson and Hermione Granger’s ages. Considering how the last film was shot in 2011, a year after Deathly Hallows: Part I, Watson had grown up another year, making her a 20-year-old, compared to her 17-year-old book counterpart. 

But thankfully, given the high stakes of this film and the dangers looming with a final showdown between Harry and Voldemort, Watson’s age difference didn’t matter for fans. People were busy watching her deliver a powerful performance as Hermione, fighting in the Battle of Hogwarts, alongside Ron and Harry. Overall, her courage, brilliance, and love for her friends defined her as an unforgettable character.

Share your opinions on the age difference between Emma Watson and Hermione Granger. 

Harry Potter films are currently streaming in the US on HBO Max.