Aging refers to the process of growing older. It primarily applies to humans, fungi and certain other animals. Contrarily, there are certain simple animals, bacteria and perennial plants that are virtually immortal. It is a biological process. Usually, it is linked to the dynamic changes in the physiological, behavioral, biological, social, environmental and psychological processes. There are numerous symptoms of aging, which develop and start to show up with time. These symptoms include wrinkles, hair graying, high frailty, decline in female fertility, muscle loss, hearing loss, increased likelihood of osteoarthritis and menopause in females. There are various diseases associated with aging such as cataract, atherosclerosis, Alzheimer's disease, cardiovascular disease, hypertension, cancer, type-2 diabetes, arthritis and osteoporosis. The occurrence of these diseases develops exponentially with age. This book unravels the recent studies on aging and the diseases associated with it. It