Helen Mirren was 64 in Legend of the Guardians: The Owls of Ga'Hoole when she played the character 'Nyra (voice)'.
That was over 14 years ago in 2010.
Today she is 78, and has starred in 148 movies in total, 50 of those since Legend of the Guardians: The Owls of Ga'Hoole was released.
In Legend of the Guardians: The Owls of Ga'Hoole, I think Helen Mirren looks: