NEW YORK – As the annual World Bank/International Monetary Fund meetings get underway in Tokyo, Japanese leaders must confront an unfolding demographic disaster. Japan’s National Institute of Population and Social Security Research recently forecast that by 2060, the country will have lost nearly one-third of its 2010 population of 128 million, and just half of this smaller population will be between 15 and 65 years old – the most productive age group in any economy.