How old was Johannes Brandt in The Song of the Nations?

Camilla HornCamilla Horn was 27 in The Song of the Nations

Birthday: Sat, Apr 25 1903 –
Wed, Aug 14 1996

Betty AmannBetty Amann was 26 in The Song of the Nations

Birthday: Fri, Mar 10 1905 –
Fri, Aug 03 1990

Erna MorenaErna Morena was 45 in The Song of the Nations

Birthday: Thu, Apr 23 1885 –
Fri, Jul 20 1962

Igo SymIgo Sym was 34 in The Song of the Nations

Birthday: Fri, Jul 03 1896 –
Fri, Mar 07 1941

Weiß-FerdlWeiß-Ferdl was 47 in The Song of the Nations

Birthday: Thu, Jun 28 1883 –
Sun, Jun 19 1949

Rudolf MeinertRudolf Meinert was 48 in The Song of the Nations as 'Director'

Birthday: Thu, Sep 28 1882 –
Fri, Jan 01 1943

Johannes BrandtJohannes Brandt was 46 in The Song of the Nations as 'Writer'

Birthday: Fri, Oct 31 1884 –
Thu, Mar 10 1955

Wolfgang GeigerWolfgang Geiger was 56 in The Song of the Nations as 'Writer'

Birthday: Sun, Jan 17 1875 –
Wed, Feb 01 1961