“…As shown in Figure 1, intelligence tests, learning and memory tests, and problem solving tests have been administered at various times over the course of the study. Data on the normal course of cognitive aging have been widely published (Alder, Adam, & Arenberg, 1990;Arenberg, 1974Arenberg, , 1976Arenberg, , 1978Arenberg, , 1982Arenberg, , 1987Arenberg, , 1990Arenberg & Thorne, 1976;Giambra, Zonderman, Friz, Arenberg, & Costa, 199 1;Robertson-Tchabo, Hausman, & Arenberg, 1976), but until now, little data has been available relevant to the long-term prediction of cognitive impairment. This paper examines the Benton Visual Retention Test and the WAIS Vocabulary subtests because these are tests for which the most data are available.…”