Dennis Weaver was 78 in Home on the Range when he played the character 'Abner (voice)'.
That was over 20 years ago in 2004.
In 2006 he died aged 81, starring in 55 films in his career, 0 of those after Home on the Range was first released. If he were alive today he would be 100.
In Home on the Range, I think Dennis Weaver looks: