Sean Astin was 37 in Alvin and the Chipmunks: The Squeakquel when he played the character 'Meerkat Manor Narrator (voice)'.
That was over 14 years ago in 2009.
Today he is 53, and has starred in 119 movies in total, 62 of those since Alvin and the Chipmunks: The Squeakquel was released.
In Alvin and the Chipmunks: The Squeakquel, I think Sean Astin looks: