How old was Gertrude Selby in The Sign of the Poppy?

Hobart HenleyHobart Henley was 29 in The Sign of the Poppy

Birthday: Wed, Nov 23 1887 –
Fri, May 22 1964

Gertrude SelbyGertrude Selby was 22 in The Sign of the Poppy

Birthday: Wed, Nov 07 1894 –
Sun, Jun 22 1975

Mina CunardMina Cunard was 21 in The Sign of the Poppy

Birthday: Sun, Dec 16 1894 –
Wed, Aug 09 1978

Wilbur HigbyWilbur Higby was 49 in The Sign of the Poppy

Birthday: Tue, Aug 20 1867 –
Sat, Dec 01 1934

Charles SwickardCharles Swickard was 55 in The Sign of the Poppy as 'Director'

Birthday: Thu, Mar 21 1861 –
Sun, May 12 1929

J. Grubb AlexanderJ. Grubb Alexander was 28 in The Sign of the Poppy as 'Screenplay, Scenario Writer'

Birthday: Sun, Dec 25 1887 –
Mon, Jan 11 1932

Harry McGuire StanleyHarry McGuire Stanley was >> in The Sign of the Poppy as 'Cinematography'

Birthday: Unknown Birthday