World Population 2024 By Age. According to the world population review, the country with the oldest age structure in the world is china with more than 166 million residents over the age of 65. United nations projections are also included through the year 2100.

According to the world population review, the country with the oldest age structure in the world is china with more than 166 million residents over the age of 65. In its 2022 publication, the un estimated that, in its medium scenario, the global population would peak in 2086 at around 10.4 billion people.