Vol. 1, Issue 6, Part G (2015)

Abstract
Aging takes place in a cell, an organ, or the total organism with the passage of time. It is a process that goes on over the entire adult life span of any living things. Represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes, it is associated with changes in dynamic biological, physiological, environmental, psychological, behavioural, and social processes. For humans in industrialized countries, life expectancy has increased significantly. Indeed, at the beginning of the 20th century, life expectancy in those countries was between 30 and 45 years. At the century’s close, life expectancy averaged about 67 years, thanks to the improvements in health care, nutrition, and standards of living. Aging is a gradual, continuous process of natural change that begins in early adulthood. During early middle age, many bodily functions begin to gradually decline. People do not become old or elderly at any specific age. Traditionally, age 65 has been designated as the beginning of old age. But the reason was based in history, not biology. Many years ago, age 65 was chosen as the age for retirement in Germany, the first nation to establish a retirement program, and it continues to be the retirement age for most people in developed societies, although this tradition is changing