David Tennant was 39 in The Pirates! In an Adventure with Scientists! when he played the character 'Charles Darwin (voice)'.
That was over 12 years ago in 2012.
Today he is 53, and has starred in 102 movies in total, 45 of those since The Pirates! In an Adventure with Scientists! was released.
In The Pirates! In an Adventure with Scientists!, I think David Tennant looks: