Robin Williams was 45 in Flubber when he played the character 'Professor Philip Brainard'.
That was over 26 years ago in 1997.
In 2014 he died aged 63, starring in 158 films in his career, 88 of those after Flubber was first released. If he were alive today he would be 72.
In Flubber, I think Robin Williams looks: