How old was Arthur Donaldson in The Salamander?

Ruth FindlayRuth Findlay was 19 in The Salamander

Birthday: Sat, Sep 19 1896 –
Wed, Jul 13 1949

Iva ShepardIva Shepard was 29 in The Salamander

Birthday: Fri, Apr 23 1886 –
Fri, Jan 26 1973

John St. PolisJohn St. Polis was 42 in The Salamander

Birthday: Mon, Nov 24 1873 –
Tue, Oct 08 1946

J. Frank GlendonJ. Frank Glendon was 29 in The Salamander

Birthday: Sat, Oct 23 1886 –
Wed, Mar 17 1937

Edgar L. DavenportEdgar L. Davenport was 53 in The Salamander

Birthday: Fri, Feb 07 1862 –
Wed, Jul 24 1918

Arthur DonaldsonArthur Donaldson was 53 in The Salamander as 'Director'

Birthday: Sat, Apr 05 1969 –
Wed, Sep 28 1955

Owen JohnsonOwen Johnson was >> in The Salamander as 'Novel'

Birthday: Unknown Birthday