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Nihon Essay and Essay : Gentosha Shinsho / What determines a happy and sad old age is "aging of the brain." The two major causes are "senile depression" and "senile dementia." In fact, the development of senile depression is slow. If you suffer from it, your life will not end. "On the other hand," senile depression "is a disease that leads to death. It can be said that it is more scary than dementia, but it is a disease that can be cured if it is properly treated. In the first place, the brain is robust among organs, and if you know it correctly and maintain it, it will not fade away easily even if it begins. The author of the bestseller 『 80 years old Wall 』 teaches the correct way to use the brain to delay aging and stay bright and positive!