Growing older cannot be impeded. The body starts aging at the time of conception and it continues aging until the body expires. Aging varies from person to person. Despite all the physiological and pathological changes, there is still no appropriate way to know the accurate age of any human body. Different people aged at different paces. Generally, age is classified into different periods. Young adulthood period is from 20-35 years when both biological and physical activities reach their peak. Young middle age period is from age 35-45 years when physical performance gradually decreases. During later middle age 45-65 years, women usually reach the menopause, and men reduce their output of sex hormones. At this age, the decrease in physical activity continues and may accelerate. In early old age 65-75 years, there may be a slight increase in physical activity, as an attempt to have some free time after retirement. By middle old age 75-85 years, people develop many disabilities. In the final stage, the very old age, over 85 years, people become very dependent and bedridden. Aging is somewhat ambiguous. It is probably distinct between universal aging and probabilistic aging. Universal aging is natural and programmed into the body that all the human share as they grow normally while probabilistic aging is the age changes that may happen to some of the people on the onset of different diseases. This is a result of damage, which accumulates over time. Our body is continuously undergoing complex biochemical reactions. Some of these reactions cause damage and, ultimately aging. Thus, aging is a complicated interaction of genetics, physiology and behavior. With aging, our body systems and organs make changes that affect our sensitivity to various diseases. Aging is associated with many chronic disorders. There are many inherent, inevitable and irreversible effects of aging like loss of capable of livingand increase in vulnerability.