Age and sex differences on four measures of cognitive ability.

138 Faculty of Education students, 20 to 56 years old, in two undergraduate programs, worked on four psychometric tests of nonverbal intelligence. Sex and program differences were nonsignificant. The positive interest correlations were significant as were the negative age-test correlations. Steep declines for scores on Spatial Ability and Matrices and gentler decrements for scores on Paper Form Board and Number Series were noted with age. The findings suggest that decreased performance on these tests reflects the influence of age differences between younger and older students in this sample.