a. Gene Mutation Theory
Aging occurs as a result of changes in biochemistry that is programmed by the molecule / DNA and every cell in turn will undergo mutation.
b. Usage and broken
Effort can lead to excess stress causes the body's cells exhausted (used up).
c. Auto Immune theory
There are certain body tissues that are not resistant to certain substances that the body tissues become weak and sick.
d. stress theory
Aging occurs due to loss of cells commonly used body . Regeneration of body tissue can not maintain a stable internal environment, excess effort and stress that causes fatigue unused cells.
e. Free radical theory
Unstable oxygen free radicals resulting in oxidation of organic matter which in turn causes the cells can not regenerate.
f. Cross-linking theory
Old cells that cause a chemical reaction of a strong bond, especially the collagen network which in turn lead to less elastic, chaos and loss of function.
g. Theory courses
Organism's ability to set the number of dividing cells after the cells are dead cells.
2. Social psychological theory
a. Activity (activity theory)
In the elderly who are successful and those who are actively involved in many social activities and maintain the relationship between the individual and the social system that is stable from middle age to old age.
b. Personality continues
It is a combination of the above theory in which the changes occur in the elderly seseroang greatly influenced by the type of personality he has.
c. Liberation theory
The breakdown in relationships or relationships with the community and setbacks individual to individual. With increasing age, a gradually began to break away from social life or withdrawn surroundings. This situation resulted in decreased social interaction elderly, both in quality and quantity so often happens double loss: loss of role, social contact barriers, reduced commitment.
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