Justin Long was 36 in Alvin and the Chipmunks: The Road Chip when he played the character 'Alvin (voice)'.
That was over 8 years ago in 2015.
Today he is 45, and has starred in 76 movies in total, 17 of those since Alvin and the Chipmunks: The Road Chip was released.
In Alvin and the Chipmunks: The Road Chip, I think Justin Long looks: