The study investigated children's and adolescents' perceptions of epistemic authorities in various knowledge domains. Children and adolescents from 4th, 8th, and 12th grades were asked to evaluate their father, mother, teacher, and friends as epistemic authorities in nine areas of knowledge content. In general, the results indicated that the perception of parents as epistemic authorities decreases with age. Nevertheless, children and adolescents continue to consider one or both parents to be the most important epistemic authorities. The perception of friends as epistemic authority increased relative to other sources in the social domains of knowledge. The perception of teachers as epistemic authority decreases with age, but in the formal knowledge domain it remains relatively stable.