In two phases, this study examined age-related changes in children's knowledge about two familiar domains and how these domains are organized in permanent memory. Forty 5-year-olds and 40 7-year-olds from a small academic community generated exemplars from the animal and cartoon character domains and provided information about sets of animals and cartoon characters. It was found that the production of exemplars increased with age, and children tended to report more animals than cartoons. Interpretations of clusters evident in children's protocols were similar for each age and reflected prior knowledge. The production of information also increased with age, and varied according to type of information and domain. It was concluded that the findings provide evidence of age changes in knowledge and serve as a critical base for future examinations of the influence of prior knowledge on memory. (Author/RH)