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联合国教科文组织在一份报告中指出,从世界各国大量的统计资料看,43岁到45岁之间男人,在生理和心理上将发生巨大的变化,为此把44岁作为一个分界点。
According to a report by UNESCO in a large number of countries in the world, men and women between the ages of 43 and 45 undergo a great deal of physical and psychological change. As a result, 44 years old is used as a demarcation point.