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Strength and range of motion of the ankle were measured in 20 normal men and 20 normal women divided equally into two age groups (25-35 and 50-60 years). Total range of dorsiflexion/plantar flexion averaged 75 degrees and the total range of inversion/eversion averaged 28 degrees. Few significant differences in range of motion were found between age groups, between men and women, or between dominant and nondominant limbs. Mean torque values for the men were greater than those for the women for all four muscle groups tested (plantar flexors, dorsiflexors, invertors and evertors). Strength of the women ranged from 62 to 70 percent of that of the men, depending upon muscle group. A multiple regression analysis showed that after the variability in muscle strength due to height and lean body weight had been taken into account, the additional variance accounted for by gender was very small. Differences in torque between age groups were not statistically significant. Differences in strength between dominant and nondominant limbs were significant only for the plantar flexors and dorsiflexors of the men.