Reconstruction of aging model for health and wellness-Challenge from Japan as a highly aged society

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We have conducted a longitudinal survey "The Tokyo Oldest old Survey on Total Health(TOOTH)" since 2008. The data for three waves was analyzed focusing on the variation and stabilization of well-being in Fourth Age, because physical and cognitive functions are decreased and social relationship is reduced in comparison with in Third Age. The results showed that well-being was not decrease but stabilized, whereas other functions such as cognitive function was decreased over 85 years old. The result of hierarchical multiple regression analysis revealed that decrease of physical function and poor state of the economy could be risk factors for well-being. On the other hand, social relationship indicated by the size of social network, social support, or social activities was supposed to contribute to well-being in Forth Age.