Michael Jeter was 32 in The Money Pit when he played the character 'Arnie'.
That was over 38 years ago in 1986.
In 2003 he died aged just 50, starring in 44 films in his career, 36 of those after The Money Pit was first released. If he were alive today he would be 71.
In The Money Pit, I think Michael Jeter looks: