Previous research in classification preference has focused on only a few selected age groups. To investigate the classification preferences of individuals from early childhood through old age in the same study, 144 individuals between the ages of 4 and 70 completed a revised version of the Conceptual Styles Test. Analysis of results showed that the number of similarity classifications increased from the 4- to the 40-year-old group and decreased thereafter; the number of complementary responses decreased and then increased. The 20-year-old group used more perceptual similarity classifications while the 30- and 40-year-old groups used more functional similarity classifications. One purpose of the study was to determine whether, as Kogan has suggested, elderly adults are more creative and free-wheeling in their classification responses than younger individuals. Two measures of creativity were employed; one was based on the experimenter's judgments and one based on the frequency with which the same response was given by other subjects. Neither measure indicated that the elderly individuals were more creative than the other age groups. (Author/JAC)