While this is not an article that covers energy issues, it falls under the broader category of China Futures. The demographic / population dimensions of ageing China have been commented on before. This article offers a very good general overview of the population-ageing issue stemming from the one-child policy.
Life expectancy has soared in China, while fertility has plummeted due to strict birth control policies. In 2009 there were 167 million over-60s, about an eighth of the population. By 2050 there will be 480 million, while the number of young people will have fallen. “It’s a timebomb,” warned Wang Feng of the Brookings-Tsinghua Centre for Public Policy in Beijing.