Richard Griffiths was 55 in Harry Potter and the Prisoner of Azkaban when he played the character 'Vernon Dursley'.
That was over 20 years ago in 2004.
In 2013 he died aged 65, starring in 57 films in his career, 18 of those after Harry Potter and the Prisoner of Azkaban was first released. If he were alive today he would be 76.
In Harry Potter and the Prisoner of Azkaban, I think Richard Griffiths looks: