David Thewlis was 40 in Harry Potter and the Prisoner of Azkaban when he played the character 'Remus Lupin'.
That was over 20 years ago in 2004.
Today he is 61, and has starred in 84 movies in total, 47 of those since Harry Potter and the Prisoner of Azkaban was released.
In Harry Potter and the Prisoner of Azkaban, I think David Thewlis looks: