To study the effects of age & sex on temporal gait parameters due to explicit prioritization during dual task performance in normal healthy individuals. 30 healthy young adults between the age group of 20 to 30 years of age and were free from acute or chronic disease and healthy old adults between the age group of 60 to 90 years of age and were able to walk independently without an assistive device. The participants performed a verbal fluency (VF) task in the seated position (i.e. as a single task). They were asked to recall as many words as possible beginning with a predefined letter during 1 minute. This task later served as the cognitive “dual task” in all of the walking conditions. For each condition, a different letter was given; each letter was used only once per participant, randomized across conditions. Mean changes in velocity in young adults in dual task having mean 388.33(P < 0.001), cognitive priority having mean 431.95(P < 0.001) and in gait priority 249.64(P < 0.01) less significant result as compared to other, similarly Mean changes in velocity in old adults dual task was 315.33(P < 0.001), cognitive priority was 346.11(P < 0.001) and in gait priority 294.81(P < 0.01). Among the young adults, the effects of secondary, cognitive task on the gait speed are strongly influenced by prioritization. These findings were less significant in the older adults, suggesting that there is an age-associated decline in the ability to flexibly allocate attention to gait. When prioritization was not explicitly instructed, the gait speed in both age group most closely resembled that of cognitive priority condition. In comparison between young male and female, the effect of secondary cognitive task on gait speed are influenced by prioritization more significantly in women than men whose findings closely resemble to that of old adults.