Thanks to its low birth rate and sophisticated healthcare system, Japan has the greatest percentage of elderly people in the world—over 28% of its population is 65 years of age or older.
Italy has one of the oldest populations in the world, with 23% of its people over 65. This is a result of both low birth rates and long life expectancies.
Twenty-two percent of Germans are over 65. The aging workforce and low birth rate challenge the nation's social and economic structure.
Twenty-two percent of Finland's population is elderly. The country's first-rate healthcare systems lead to increased life expectancy and an aging population.
Portugal's population is aging, with more than 22% of people over 65. It's one of the oldest countries in Europe because of its low birth rate and high life expectancy.
In Greece, the elderly make up about 21% of the population. The aging of society and the decline of the younger generation are caused by low birth rates and economic difficulties.
South Korea's population is aging quickly; 18% of them are above 65. The population is changing due to a decrease in fertility and a rise in life expectancy.