China's labour population will show a downward trend as workers born during the baby boom in the 1960-70s begin to retire in 2021, Yao Meixiong, deputy head of the Centre for Population Census of Fujian Provincial Bureau of Statistics said.
By the end of 2014, China had 212 million people aged above 60, accounting for 15.5 per cent of the total, according to the Ministry of Civil Affairs.
He said the population under 14 years old only accounted for 16.5 per cent of the country's total, compared with the world's average of 27 per cent.
The population of workers aged between 16 and 59 shrank by 3.71 million year on year in 2014, official data showed.
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"For people less than 19 years old in 2010, 172 million were males, 22.1 million more than females. This means about 10 per cent of male youths will find it hard to find female spouses beginning in 2020," he said.
Officials say that about the one-child policy aimed at restricting the growth of the population has prevented over 400 million births.
China, the world's most populous country has over 1.357 billion population as of 2013 census. China partially lifted the one-child policy during a pilot programme in Zhejiang Province in January 2014, allowing couples to have a second child if either parent is an only child.
However, Yao said the policy is not enough to fill the future labour shortfall as couples qualified to bear a second child are not always willing to do so.
Initial response to relaxation was not very enthusiastic due to parental worries about heavy expenditure.