Frank Welker was 51 in Scooby-Doo on Zombie Island when he played the character 'Fred Jones (voice)'.
That was over 26 years ago in 1998.
Today he is 78, and has starred in 386 movies in total, 203 of those since Scooby-Doo on Zombie Island was released.
In Scooby-Doo on Zombie Island, I think Frank Welker looks: