How Many Dvakrát do tej istej rieky (1976) Cast Members Are Still Alive?

Dvakrát do tej istej rieky (1976) featured a cast of 6 tracked actors. Of these, 3 (50%) are still alive today and 3 have passed away. The oldest surviving cast member is Milan Kňažko, age 81. This film starred Soňa Valentová and Ivan Mistrík.