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As of the end of 2016, the number of seniors aged over 60 in China had reached around 230.8 million, accounting for 16.7 percent of the total population, official data showed.

As of March 23, 13,155 such enterprises in Hubei had resumed work, with 1.71 million employees having returned to their posts, accounting for 60.3 percent of the total.

As of Monday, however, all major foreign trade companies had restarted production at full scale in Hainan, Lu said.

As parents age, most children have no siblings to share the burden of helping to care for them. Wang Guangzhou, a demographic researcher with the Chinese Academy of Social Sciences, has estimated that China had about 145 million children without siblings in 2010. A report by the Office of the National Commission on Aging showed more than 1 million families had lost their only child as of 2012, and the number is projected to increase by 76,000 annually.

As one of the most common major chronic diseases in the world, hypertension is the "silent killer" among cardiovascular and cerebrovascular diseases. It not only has high disability and mortality rate, but also puts a severe strain on limited medical resources, which places a heavy burden on families and society.