David Thewlis was 45 in Harry Potter and the Half-Blood Prince when he played the character 'Remus Lupin'.
That was over 15 years ago in 2009.
Today he is 61, and has starred in 84 movies in total, 37 of those since Harry Potter and the Half-Blood Prince was released.
In Harry Potter and the Half-Blood Prince, I think David Thewlis looks: