China's working-age population dropped by 2.44 million to 919.54 million in 2013, the second year of decline, the National Bureau of Statistics announced on January 20.

The working-age population, which covers those between 15 and 59, accounted for 67.6 percent of the country's total population in 2013, down 1.6 percentage points from 2012.

In 2012, China declared its first absolute drop in the working-age population in "a considerable period of time."

Those aged above 60 accounted for 14.9 percent of the total population to 202.43 million while those above 65 made up 9.7 percent.

At the end of 2013, the Chinese mainland's population stood at 1.36 billion, with a natural population increase rate of 0.5 percent.