Harry Melling was 14 in Harry Potter and the Prisoner of Azkaban when he played the character 'Dudley Dursley'.
That was over 20 years ago in 2004.
Today he is 35, and has starred in 17 movies in total, 14 of those since Harry Potter and the Prisoner of Azkaban was released.
In Harry Potter and the Prisoner of Azkaban, I think Harry Melling looks: