Discusses two experiments in which middle-aged, elderly, professional, and non-professional males and females were given the Conceptual Styles Test. An analysis of variance on the percentage of complementary responses revealed significant effects for age, occupation, and th interaction between age and sex. (ED)

This study examined the performance of middle aged and elderly adults on the Piagetian tests of class inclusion and multiple classification. (GO)

Studied adults (ages 20-79) presented with two types of problem-solving tasks: a typical task used in problem-solving research, and a task composed of practical daily life problems. Results indicated that developmental function depends on the type of problem presented, while performance on abstract problems may decrease with age. (Author)

Education, not age per se, is related to conservation ability during the adult years. Age differences should not be interpreted as age changes without using the more appropriate designs which separate age and cohort effects. Results emphasize the relationship between education and cognitive abilities among the elderly. (Author)