Aging is natural process with physiological changes many of them merely a decline in the rate of functioning. Aging does not begin on the day of retirement from service or at the age of sixty, rather growing old is a continuous and universal process, which occurs to every minute that passes. Loss of musculature, generalized weakness and change in body composition in elderly is the, multifactorial process which is due to the combination of ,the adoption of sedentary lifestyle and a less than the required food nutrients. Increasing evidence by researchers indicate to a vague anabolic response after a mixed nutrient meal as a likely explanation for chronic age-related muscle wasting and change in body composition of fat, bone and musculature. However, there is general agreement that moderately increasing daily protein intake beyond 0.8 g·kg –1 ·d –1 may enhance muscle protein anabolism and provide a means of reducing the progressive loss of muscle mass with increasing age. The objective of the research was to see the effect of protein diet associated with resistive exercise induced changes in body composition and muscle size and the strength in geriatrics. To accomplish the task sample of 120 people were selected from each stratum of sports, diseased and normal group, after selecting the required sample, subjects were given trails of protein, exercise, protein and exercise, and some of them were not given any stimulant, they remained as control group. After going through the whole process of inducing various stimulants (protein, exercise, protein and exercise), laboratory investigations and statistical analysis. It has been found that protein, exercise, protein and exercise have considerably changed the body composition, and a significant enhancement is observed in the muscle size and strength in geriatrics.