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What is Aging

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Body cells, with aging become larger and are less able to split and multiply (Panno, 2004). At this time, there is an increase in pigments and lipids causing lose in their functioning abilities or even function unusually. As a result cause the various organs to work harder than their normal ability that makes them ware out or fail to function totally (Holliday, 2007). The process of aging is viewed to include both the psychological, social and physical changes in the human body. They are often caused by the life events such as socioeconomic backgrounds, illness and genetic traits (Emerson, 1977). At a given level in life, physiological state of a particular age determines whether a person continues to live or dies. The most appropriate indicators of loss of physiological function with age include the mortality rate, age-specific rate of continued existence and its compliment as well as reproductive decline or menopause (Holliday, 2007). Aging process can be best seen as an aspect of an adjustment that is due to the decline in the forces of natural selection as one move from childhood to adulthood. In an event that these factors stop, aging eventually ceases, and adaptation stabilizes even though at a low level compared to the normal rate (Holliday, 2007). Some adaptation factors may still survive up to the old age. very few might hasten their speed whereas others can come to a halt (Panno, 2004). Therefore it is not right to say that all the physiological wear and tear are as a result of aging an must continue throughout a person’s life. An understanding on how the aging process and age-specific mortality respond to ecological variation requires a theory of how natural selection has acted upon human life over the course of human development (Morgan amp. Kunkel, 2001). That is the reason why various schools of thought have come up with two different theories of aging. The theories have been able to explain why the ability of life of an individual of the age of 65 years and above has a key role in his/her adaptation as well as other characteristics that are equally vital for evolution, such as. damage based and programmed theories. Programmed theory simply states that aging follows a biological time table that could be the one that controls growth from childhood to adulthood, while on the other hand. damage theory emphasizes on the ecological factors that lead to collective damage at different levels in life and are the cause of aging (Morgan amp. Kunkel, 2001). Other scholars also argue that aging occurs as a result of interaction among lifelong factors such as. diet, heredity, exercise and leisure, culture, past illness among others. Aging theorists are more concerned with what causes the process, when exactly does it begins, what are the symptom of aging as well as how it can be delayed (Gorman amp. Kandl, 2006). Evolutionary theory is mainly concerned with why aging occurs in human beings. They tend to put in plain words in various term how aging occurs in structures and function within the body (Morgan amp. Kunkel, 2001). The physiological theories have the view that the process of aging is mainly due to the inherent timing mechanisms and signals that occur by chance or through accidents. In their effort to clarify the concept aging, they stand by the view that it is as a result of mutation to the DNA that can cause wrong enzyme, protein formation. Potentially harmful substances do accumulate in the body over the years. The most recognized substance that to accumulate in the body cells is Lipofuscin which is a mixture of chemical waste products from normal cellular activities (Morgan amp. Kunkel,