The oropharyngeal satiety mechanism of thirst in the elderly is a subject not resolved. However, since other oropharyngeal senses such as taste changes with age, it may be that oropharyngeal satiety mechanism of thirst is also diminished with age. This however remains to be proven experimentally. This work therefore investigates thirst perception (TP) and water intake in young males (n = 10, age = 19 – 25 years) and older males (n = 9, age = 44 – 58 years). All the subjects live a normal active life, that is they go about their daily business or work but none of them, was athletically trained as “defined by the absence of a regular exercise programme during the last six months before the experiment” (Kokkinos et al, 1995). Thirst perception (TP) and dryness of mouth (DM) before exercise were obtained using the visual analogue scale (Takamata et al, 1994). Thereafter subjects performed exercise at 30kmh-1 till exhaustion at a workload of 0.5kgm on a bicycle ergometer. After exercise TP, DM and water intake were assessed. Subjects did not drink any water during the exercise but were given clean tap water ad libitum at 16OC to drink at the end of the exercise (Boulze, et al, 1983). The results are presented as mean ± standard error of mean. The paired and unpaired student t-test was used to compare the difference between the means within a group and between the group means respectively. The basal TP and DM in the older males were 1.08 ± 0.40cm and 0.6 ± 0.29cm respectively, and that of the young males were 1.46 ± 0.47cm and 1.63 ± 0.55cm respectively. There was no significant difference in the basal TP and DM between the young and older male subjects. After exercise the changes in TP and DM in the young males (3.75 ± 0.93 and 3.23 ± 0.92) and in the older males (1.26 ± 0.57 and 1.48 ± 0.76) did not show any significant difference. However the time spent on exercise (43.2 ± 3.53mins for young males and 9.6 ± 1.28min for older males) and the water intake after exercise (405 ± 47.29ml and 160 ± 70.0ml for the young and older males respectively) were different (p<0.05). It is concluded therefore that thirst following dehydration in older males is similar to that of young males. The difference in fluid intake between the young and older males might be due to the time spent on exercise. Thirst perception might not show a decrease with increase in age as does taste.