That was over 8 years ago in 2013.
Today she is 27, and has starred in 26 movies in total, 13 since Byzantium was released.
In Byzantium, I think Saoirse Ronan looks:
Byzantium scores 6.2 out of 10 on The Movie Database.
Saoirse Ronan's first acting role was as 'Briony Tallis (Age 13)' in Atonement, released in 2007 when she was 13.
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