Koľko rokov mali herci vo filme Peter och Petra (1989)?

Based on a short story from Astrid Lindgren. Peter and Petra are two small children. Two very small children! No bigger than two small dolls! They belong to the Little People, but their mom and dad think that even the Little People need to learn to read and write. They are allowed to start at a regular school, and Peter and Petra end up in Gunnar's class.