Japan's aging has reached a new level as a government estimate showed Tuesday people aged 75 or older make up more than half of the country's elderly population, highlighting the need to tackle pressing issues of medical and nursing care.The number in the age group was estimated at 17.70 million, eclipsing for the first time the number of people aged 65 to 74, which stood at 17.64 million, according to the Ministry of Internal Affairs and Communications' preliminary demographic estimate as of March 1.With the country's population rapidly graying, ballooning social security costs are increas…READ FULL ARTICLE