The effect of age on verbal fluency was studied in 84 healthy voluntee
rs, ages 45 to 91 years, who performed letter-fluency and semantic-flu
ency tasks. Older subjects (75 to 91 yr.) performed as well as younger
(50 to 64 yr.) on letter fluency but did significantly worse on seman
tic category fluency. This pattern is similar to that observed in Alzh
eimer-type dementia.