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UN projections show median age of Chinese citizens will overtake that of Americans in 2020. Yet China's median income is only a quarter of that in the U.S. Life expectancy in China today is 76, very close to that in America. In 1960 a Chinese person born that year had life expectancy of 44 years.  China is aging at the pace of Japan, and a bit slower than South Korea, but wealth per capita was three times higher in South Korea and Japan than China when the aging accelerated. A Chinese woman fertility rate today is 1.6 compared to 4.6 in 1973.

A prominent Chinese economist says in a recent report that median age in China in 2050 will be nearly 50 compared to 42 in America and 38 in India. WSJ cites figures showing China will have gone from 9 working age adults per retired person in 2000 to just two by 2050.

So how to pay for retirement of all these workers today? Government spending on retirement is a tenth of GDP, about half the level in older wealthier countries, and increase in spending will impact growth. Today this is about 6.2% potential growth rate. It also pushes wages up with a shortage of workers in cities such as Shenzen and X'ian even with the use of new technology and robots in factories. 

Solutions are to raise retirement age currently set at 60 years, increasing labor force participation of women as Japan has done, and increasing productivity. China has transferred 10% equity stakes in four state owned financial firms to the national pension fund to shore up its finances as estimates from the Chinese Academy of Social Sciences show it running out of money in 2035.

Traditionally children supported families in old age but the one child policy leads to situations where the child is working or in another city. In Suzhou near Shanghai, a retirement business sends 1800 helpers to private homes and 130,000 retired people, in a new trend. The city administration of Shanghai plans 400 neighborhood care centres for elderly by 2022, with health clinics, drop in facilities, and homes. 12,000 elderly people use one centrre in central Shanghai area of Changning.