Resource
Social security reform: Does partial privatization make sense for China?
Summary (English)
"The challenges of population aging and rising dependency ratios are in part the result of increased life expectancy, but the major factor has been the rapid decline in fertility, due, in large part, to China's strict one-child policy instituted in the mid 1970s. In the future, many Chinese couples will face the task of caring for four elderly parents as well as some grandparents. These changes in family structure and the increase in rural-urban migration due to uneven rates of economic growth are two of the factors contributing to a breakdown of the traditional family support system, which remains the major source of old-age support."
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From PensionReforms