How old was Iván Petrovich in The bat?

Anny OndraAnny Ondra was 29 in The bat

Birthday: Thu, May 15 1902 –
Sat, Feb 28 1987

Georg AlexanderGeorg Alexander was 43 in The bat

Birthday: Tue, Apr 03 1888 –
Tue, Oct 30 1945

Oskar SimaOskar Sima was 35 in The bat

Birthday: Fri, Jul 31 1896 –
Tue, Jun 24 1969

Hans JunkermannHans Junkermann was 59 in The bat

Birthday: Sat, Feb 24 1872 –
Sat, Jun 12 1943

Iván PetrovichIván Petrovich was 37 in The bat

Birthday: Mon, Jan 01 1894 –
Thu, Oct 18 1962

Jaro FürthJaro Fürth was 60 in The bat

Birthday: Fri, Apr 21 1871 –
Mon, Nov 12 1945

Karel LamačKarel Lamač was 34 in The bat as 'Director'

Birthday: Wed, Jan 27 1897 –
Sat, Aug 02 1952

Hans H. ZerlettHans H. Zerlett was 39 in The bat as 'Writer'

Birthday: Mon, Oct 17 1892 –
Wed, Jul 06 1949

Otto HellerOtto Heller was 35 in The bat as 'Cinematography'

Birthday: Sun, Mar 08 1896 –
Thu, Feb 19 1970