Abstract
To provide an interval scale for measuring intellectual growth and decline, the Rasch method of scaling was applied to the raw scores of 666 individuals ranging from Grade 2 to college. From about ages 8 to 19, growth in the resulting theta scores was approximately linear. Subsequent application of these theta scores to data collected from 300 adults in their 20s to their 70s showed that the decline was also approximately linear from about ages 19 to 75. Earlier reports of rapid intellectual decline in the later years of life, and great variability, appear to be erroneous
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