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This paper reports findings from 111 Ss tested with the Stanford-Binet (S-B) at preschool and adolescence who were administered the S-B and WAIS at adulthood. Correlations of preschool IQs with adult S-B and full WAIS IQs are .59 and .64; of adolescent IQs with adult IQs, .85 and .80. Mean S-B IQ increase from adolescence to adulthood is 11 points, indicating that mental growth continues beyond 16 years. Males show more IQ gain after adolescence than do females (p < .01). Girls with high IQs increase least. Analysis of increases in percent passing S-B items shows more growth after adolescence in abstract reasoning and vocabulary than in rote memory and practical reasoning. Preschool verbal and memory items are better predictors than nonverbal items of both verbal and performance adult IQs. Pattern of individual differences in relative amounts of these abilities shows some stability over 25 years.

scores on both the S-B and WAIS indicated mental growth between the ages of 30 and 44, although the pattern of the growth between these ages has not been determined. The limits of the mental growth curve were not established. The higher the preadult level of intelligence for men, the more they gained in later years; whereas the higher the preadult level of intelligence for women, the less they gained in later years. The question of whether bright women tend to inhibit in some way the full realization of their intellectual potential deserves further attention.1 Requests for reprints should be sent to Jon Kangas who is now at the Testing and Counseling Services

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