Leslie Nielsen. Leslie Nielsen was 67 in The Unknown Marx Brothers as 'Self - Narrator'.
Groucho Marx. Groucho Marx would have been no older than 86 in The Unknown Marx Brothers as 'Self (archive footage)'.
Chico Marx. Chico Marx would have been no older than 74 in The Unknown Marx Brothers as 'Self (archive footage)'.
Harpo Marx. Harpo Marx would have been no older than 75 in The Unknown Marx Brothers as 'Self (archive footage)'.
Maxine Marx. Maxine Marx was 75 in The Unknown Marx Brothers as 'Self'.George Fenneman. George Fenneman was 73 in The Unknown Marx Brothers as 'Self'.Irving Brecher. Irving Brecher was 79 in The Unknown Marx Brothers as 'Self'.David Leaf. David Leaf was 41 in The Unknown Marx Brothers as 'Director, Writer'
John Scheinfeld. John Scheinfeld was >> in The Unknown Marx Brothers as 'Director'Bill Marx. Bill Marx was >> in The Unknown Marx Brothers as 'Original Music Composer'