How old were the actors in Ingmarsarvet (1925)?

When his ancestors seem to appear in the clouds during a storm of biblical proportions, young Ingmar decides to give up his career as the village teacher and to reclaim the land and farm of his fathers. The same stormy night, the charismatic preacher Helgum arrives in the village to spread the word about the promises of the Holy Land, which turns parents and children, men and wives, brothers and sisters, against one another. Ingmar is torn between his love for the headmaster’s daughter Gertrud who is under the preacher’s spell, and the prospects of marrying the judge’s daughter Barbro in order to keep the farm.