For the first time, Japan's over 75s account for over 15 percent of the population after their cohort rose by 720,000 to 19.37 million people, government data released Sunday showed, in further evidence of the country's rapidly graying society.Also hitting record highs this year were the over 65s, or seniors, accounting for 29.1 percent of the population, or 36.27 million people, according to Ministry of Internal Affairs and Communications data released ahead of Monday's Respect for the Aged Day holiday.Japan tops the world rankings for oldest society by proportion of over 65s, well above I…READ FULL ARTICLE