Most of the population using a language and culture that are the same, Japan. Japan has a population of approximately 82 years average age demographic is the longevity in the world.
The majority of Japanese language and culture alike. Japan's population average age about 82 years to count the country's most populous country in the world longevity.
Most of the population and use of Japanese culture. The population of Japan, with the average age of 82 years. It is the country with the most longevity one country in the world.