how old is emma watson in each harry potter
She began when she was 11 years old and ended when she was 21.
Emma Watson
Emma Charlotte Duerre Watson (born 15 April 1990) is an English actress, model, and activist. Born in Paris and raised in Oxfordshire, Watson attended the Dragon School and trained as an actress at the Oxford branch of Stagecoach Theatre Arts. As a child, she rose to prominence with her first professional acting role as Hermione Granger in the "Harry Potter" film series, having acted only in school plays previously.

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Emma Watson [SEP] Introduction
She went on to star as Belle in the musical romantic fantasy "Beauty and the Beast" (2017) and Meg March in the coming-of-age film "Little Women" (2019), the latter of which was nominated for the Academy Award for Best Picture. Her other film roles include "Regression" (2015), "Colonia" (2015), and "The Circle" (2017). From 2011 to 2014, Watson split her time between working on films and continuing her education, graduating from Brown University with a bachelor's degree in English literature in May 2014. Her modelling work has included campaigns for Burberry and Lancôme. She also lent her name to a line of clothing for People Tree.