Roddy McDowall was 42 in Bedknobs and Broomsticks when he played the character 'Mr. Jelk'.
That was over 53 years ago in 1971.
In 1998 he died aged 70, starring in 166 films in his career, 105 of those after Bedknobs and Broomsticks was first released. If he were alive today he would be 95.
In Bedknobs and Broomsticks, I think Roddy McDowall looks: