Abstract
This paper presents the results of a longitudinal study of sex differences in intelligence as a test of Lynn’s (1994) hypothesis that from the age of 16years males develop higher average intelligence than females. The results show that at the ages of 7 and 11years girls have an IQ advantage of approximately 1 IQ point, but at the age of 16years this changes in the same boys and girls to an IQ advantage of 1.8 IQ points for boys.
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