Growth rate and age structure of Ae. epipedostoma (Fagot) were studied based on monthly samples from a population in Muszkowice (SW. Poland). The life cycle is probably a three-year cycle: juveniles hatch from July till September, and winter over at a size of 2.6–3.5 whorls. The growth rate is ca. 0.5 whorl/month. In their second season, the snails resume growth in spring to reach 4 whorls in May-July; they reproduce in the same season and at least some of them winter over again.