Frank Welker was 51 in The Rugrats Movie when he played the character 'Spike / Monkeys / Scar Snout (voice) (uncredited)'.
That was over 25 years ago in 1998.
Today he is 78, and has starred in 386 movies in total, 201 of those since The Rugrats Movie was released.
In The Rugrats Movie, I think Frank Welker looks: