Age is a natural process of gradual change that begins in early adulthood, including physical and mental changes. Many body functions start to deteriorate gradually after the early middle age. Physiology, heredity, lifestyle, senescence, biology and other factors have an impact on the aging process. Cataracts and refractive errors, osteoarthritis, depression, chronic obstructive pulmonary disease, dementia as well as neck and back pain are common conditions that are related with aging. Some people are more prone to have multiple diseases at once as they get older. Alzheimer's disease, arthritis, atherosclerosis and cardiovascular disease, hypertension, osteoporosis, cancer, and type 2 diabetes are a few more examples of aging-related diseases. These diseases rise exponentially with age. This book provides significant information to help develop a good understanding of aging. It covers in detail some existent and innovative concepts revolving around this domain. The extensive content of this book provides the readers with a thorough understanding of the subject.