Peter Boyle was 67 in Scooby-Doo 2: Monsters Unleashed when he played the character 'Old Man Wickles'.
That was over 20 years ago in 2004.
In 2006 he died aged 71, starring in 77 films in his career, 3 of those after Scooby-Doo 2: Monsters Unleashed was first released. If he were alive today he would be 88.
In Scooby-Doo 2: Monsters Unleashed, I think Peter Boyle looks: