We measured age and gender differences in children's awareness and endorsement of gender stereotypes about math, science, and verbal abilities in 463 fourth, sixth, and eighth graders. Children reported their perceptions of adults' beliefs and their own stereotypes about gender differences in academic abilities. Consistent with study hypotheses, fourth and sixth graders had a stronger tendency than eighth graders to favor their own gender group rather than report traditional stereotypes. On average, girls favored girls over boys in all three domains. Fourth grade boys favored boys in all three domains; middle school boys reported traditional verbal stereotypes and were on average egalitarian in beliefs about math and science. Children's reports of their perceptions of adults' stereotypes mirrored age and gender differences in their own stereotypes and were correlated with their own stereotype endorsement. In addition to showing beliefs favoring girls in verbal domains and a tendency for most age and gender groups to not endorse traditional math and science stereotypes, the results support a synthesis of developmental and social identity theories regarding individual differences in children's stereotype endorsement. Children's tendency to favor girls in verbal domains may contribute to gender differences in educational and career choices by pulling girls toward the humanities and social sciences and discouraging boys from pursuing those domains.