Which country has the oldest population in the world?

Japan is known for having the oldest population in the world. According to World Population Review, the median age in Japan is 48.4 years old as of 2021, which means half of the population is older than that age. This is primarily due to declining birth rates, an aging generation, and overall longer life expectancies. In fact, it's projected that by 2050, over 35% of the population in Japan will be over the age of 65. This creates unique challenges for the country in terms of healthcare, social security, and pensions. Despite these challenges, Japan has developed innovative solutions to help support its aging population. For example, companies have developed technology to support elderly individuals living on their own, such as robots that can help with household tasks or monitor health. The government has also implemented policies to encourage older workers to remain in the workforce and to provide more affordable healthcare options.