The problem of old age in china关于这个的英语短文,急求!

The main cause of the aging problem in China is due to the improvement of medical condition, social culture and scientific technology so both the birth rate and mortality rate of China keep decreasing while the average life expectancy of the people keeps increasing. In 1950, the average life expectancy of China was less than 40 years old and has risen to 71 years old now.
The "Birth Control" policy of China implemented in the late 1970s focuses on the control of the population. According to the census, in the past 20 years, China has reduced 240 millions of birth. As the structure of the population could not be changed, when fast growth of the population was under control, the population structure could not but develop in the trend of aging, thus caused the historical change of the age structure of Chinese population.
The problem of aging in China has a far-reaching impact on the China’s economic sustainable development and is a double-edged sword, which has both positive and negative aspects. The key point lies in how to convert the negative aspects into the positive aspects and how to develop the positive impact and reduce a negative one.
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