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The median age is the index that divides the entire population into two numerically equal age groups, one younger than that age and the other older than that age. It is the only index associated with the age distribution of a population. [1]
China's fertility rate is lower than Japan's and is aging faster than almost every other country in modern history. [110] More than a third of the world's elderly (65 and older) live in East Asia and the Pacific, and many of the economic concerns raised first in Japan can be projected to the rest of the region. [111] [112]
China's population pyramid, 2023 to 2100, as projected by the United Nations in 2022. China's population is aging faster than almost all other countries in modern history. [1] [2] In 2050, the proportion of Chinese over retirement age will become 39 percent of the total population according to projections.
How the age of a Korean person, who was born on June 15, is determined by traditional and official reckoning. Traditional East Asian age reckoning covers a group of related methods for reckoning human ages practiced in the East Asian cultural sphere, where age is the number of calendar years in which a person has been alive; it starts at 1 at birth and increases at each New Year.
The earliest traces of early humans, Homo erectus, in East Asia have been found in China. Fossilized remains of Yuanmou Man were found in Yunnan province in southwest China and have been dated to 1.7 Ma. Stone tools from the Nihewan Basin of the Hebei province in northern China are 1.66 million years old. [24]
Such records can only be determined to the extent that the given country's records are reliable. Comprehensive birth registration is largely a 20th-century phenomenon, so records establishing human longevity are necessarily fragmentary. The earliest comprehensive recordkeeping systems arose in Western Europe.
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If counting from the following Shang dynasty which has been universally recognized by historians, China has only about 3,700 years of recorded history, which is still a big gap from 5,000 years. [13] [14] At the same time, some archaeologists and scholars view that China's civilization perhaps might well be more than 5,000 years old.