How old was Leontine Kühnberg in The Silent Mill?

Alfred AbelAlfred Abel was 35 in The Silent Mill as 'Johann'.

Birthday: Tue, Mar 11 1879 –
Sun, Dec 12 1937

Ferdinand BonnFerdinand Bonn was 52 in The Silent Mill as 'Mühlknecht David'.

Birthday: Fri, Dec 20 1861 –
Sun, Sep 24 1933

Robert ValbergRobert Valberg was 30 in The Silent Mill as 'Martin'.

Birthday: Mon, Apr 28 1884 –
Sat, Oct 15 1955

Leontine KühnbergLeontine Kühnberg was 25 in The Silent Mill as 'Gertrude'.

Birthday: Mon, Sep 09 1889 –
Mon, Dec 31 1945

Otto ReinwaldOtto Reinwald was 15 in The Silent Mill

Birthday: Wed, Aug 23 1899 –
Mon, Jul 01 1968

Richard OswaldRichard Oswald was 34 in The Silent Mill as 'Writer, Director'

Birthday: Fri, Nov 05 1880 –
Wed, Sep 11 1963

Hermann SudermannHermann Sudermann was 57 in The Silent Mill as 'Novel'

Birthday: Wed, Sep 30 1857 –
Wed, Nov 21 1928