Aging can generally be described as the process of growing old and is an intricate part of the life cycle. Basically, it is a multi-dimensional process and affects almost every aspect of human life. Introduction to the study of human aging have typically emphasized changes in demography focusing on the ‘aging of population’- a trend, which has characterized industrial societies throughout the twentieth century but in recent decades, has become a worldwide phenomenon. Aging is basically the result of a two-dimensional demographic transformation which is explained by overall declines in mortality and fertility.
This is a dynamic process was first observed in post-industrial European societies in the nineteenth century. Physical and health risks are very high among the aged. The precise implications of population aging for future levels of health and health care utilization depend on whether the increases in life expectancy experienced in general are accompanied by an increase or decrease in health problems in later life.