Real age of Emma Watson in Harry Potter and the Prisoner of Azkaban
In the movie Harry Potter and the Prisoner of Azkaban, Emma Watson was:
13 years old
That was the real age of the celebrity according to our calculation.
The calculation of the shown age took into account the first day of the year in which the movie Harry Potter and the Prisoner of Azkaban was released:
January 1, 2004
And the day in which Emma Watson was born:April 15, 1990
Since movies usually don't take more than one year to be released since the beginning of the filming process, Emma Watson may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.