Japan experienced net population loss in recent years due to falling birth rates and almost no net immigration, despite having one of the highest life expectancies in the world at 81.25 years of age as of 2006, says Wikipedia.[2]
Based on the Health and Welfare ministry estimation released in January 2012, Japan's population will keep declining by about one million people every year in the coming decades, which will leave Japan with a population of 87 million in 2060. Current pop. is 128 million. By that time, more than 40% of the population is expected to be over the age of 65.[4]
According to a government survey, more than a quarter of unmarried men and women between the ages of 30 and 34 are virgins. 50% of men and women in Japan said they were not “going out with anybody”.[41]
Metropolitan Tokyo-Yokohama, with 35,000,000 people, is the world's most populous city.
Japan faces the same problems that confront urban industrialized societies throughout the world: over-crowded cities and congested highways.