The scientific study of the phenomena of aging is known as gerontology. It traces the progressive changes that take place in a cell, a tissue, an organ system and a total organism, with the passage of time. However, gerontology has a major focus on the changes that occur between the accomplishment of maturity and the death of the individual and the factors influencing these changes. Social and economic, psychological aspects of aging, physiological basis of aging and general biological aspects of aging in all animal species are the four major categories where the problems of gerontology fall. Gerontology aims to learn about the aging process for the purpose of minimizing the disabilities and handicaps of old age rather than the purpose of extending the life span. The book studies, analyzes and upholds the pillars of gerontology and its utmost significance in modern times. It is compiled in such a manner, that it will provide an in-depth knowledge about the theory and practice of gerontology. This book is appropriate for students seeking detailed information in this area as well as for experts.