SUMMARY
Despite zenith in the field of scientific knowledge, any pin pointed factor behind the phenomenon of longevity and life expectancy has not yet been known. There are so many contributors that work together in affecting the span of life expectancy. Review of the literature reveals that participation in physical activities and exercises, use of proper diet, healthy lifestyle behaviour, avoidance of smoking and obesity are vital and they all have crucial role in determining the length of the life span. This paper is aimed at to review the existing body of literature in perspectives of the factors contributing or otherwise with reference to the longevity and life expectancy. The factors examined in this paper include exercise & physical activity, diet and smoking. In view of the existing literature it has become evident that life expectancy is something that can be extended to a desirable limit provided consolidated efforts are put forth with reference to health care and healthy life style behaviour.