How old were the actors in Bohouš (1968)?

Alois, manager of a remote mountain inn, loses his maid when she can’t stand his oversized Saint Bernard, Bohouš. When a ravenous guest arrives, Alois makes a wager: if the guest can out-eat Bohouš in one sitting, they earn a free week’s stay; if not, they must serve as the inn’s maid for a week.