Fredric MarchFredric March was 52 in The Twentieth Century as 'Oscar Jaffe'.
Robert H. HarrisRobert H. Harris was 38 in The Twentieth Century 
E.G. MarshallE.G. Marshall was 35 in The Twentieth Century 
Lilli PalmerLilli Palmer was 35 in The Twentieth Century as 'Mildred Plotka / Lily Garland'.
Marc DanielsMarc Daniels was 37 in The Twentieth Century as 'Director'
Ben HechtBen Hecht was 55 in The Twentieth Century as 'Writer'Charles MacArthurCharles MacArthur was 54 in The Twentieth Century as 'Writer'Charles Bruce MillhollandCharles Bruce Millholland was 46 in The Twentieth Century as 'Writer'