Robin Williams was 39 in FernGully: The Last Rainforest when he played the character 'Batty Koda (voice)'.
That was over 32 years ago in 1992.
In 2014 he died aged 63, starring in 158 films in his career, 113 of those after FernGully: The Last Rainforest was first released. If he were alive today he would be 72.
In FernGully: The Last Rainforest, I think Robin Williams looks: