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Four stratified, random groups, ages 25-29, 35-39, 45-49, and 55-64, were drawn from the Puerto Rican population during the selection of the standardization sample for the Spanish language Wechsler Adult Intelligence Scale (WAIS). These groups were altered by the substitution of sufficient cases to make their educational distributions nearly identical. All subjects were administered the newly adapted Spanish language version of the WAIS during the period in which its standardization was being conducted. Results indicate that Full Scale scaled score means rise to age 40 and never fall; Verbal total scaled means rise to age 50 and never fall; Performance total shows a small decline after age 40-due primarily to Digit Symbol Substitution. Various analyses of the Spanish WAIS and of the United States WAIS standardization data give strong support to these results.Much research has been devoted to changes in intellectual functioning as an adult ages. Confusion pervades the issue. Many people believe that intelligence declines between the ages of 25 and 65 (Jones, 1959;Wechsler, 1958). Others, to the contrary, believe that it continues to rise to at least age 50 (Bayley, 1955;Tyler, 1965). The purpose of this and following papers is to present new data in support of the viewpoint that intelligence as measured by the Wechsler Adult Intelligence Scale (WAIS) increases until approximately age 65. A

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