تعاریف و نظریه های سالمندی

The adult age occurs when somebody reaches 65 years of age. It consists of gradually destruction of the structure and organism of the body during a long period. It leads to transformation of structure and process of different organs, such as: turning the hair white, hair falling, skin wrinkling, visual and hearing reducing, back curving, muscle power reducing, memory and perception disordering and reducing in capacity and function of pulmonary and cardiovascular systems.Theories presented in the field of the adult age consisting of: A) biological theories classified by three groups: 1. Immunity theory 2. Cellular aging theory 3. Free radical theory B) psychological theories Qsociological theories that are classified by four groups: 1. Theory of non-commitment 2. Activity theory 3. Continuity theory 4. Interaction theoryEach of the above theories provides justifications regarding the aging process and it is of importance to be aware of those theories in order to establish an information network for practically determinations regarding the adult age.