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Something significant is happening to the world population-it is aging. The median(中位数的)age of an American in 19501．(be)30-today it is 41 and is expected2．(increase)to 42 by 2050. For Japan, the3．(number)are more striking-22 in 1950, 46 today and 53 in 2050. In 2015, one in 12 people around the world were over 65；by 2050, it will be one in six.

This aging of the population is driven4．two factors. The first is declining birthrates, which means old generations are large5．(compare)to younger generations, and so, on average, the population becomes6．(old)than before. This is7．(particular)true in the US. The second reason is that people are living longer. A child born in the US today has8．very realistic chance of living beyond 100 and needs to plan accordingly.

People tend to focus on the first factor. However, greater attention should9．(place)on longevity(长寿). It isn't just that people are, on average, living longer. It's also that they are on average healthier10．more productive for longer. Therefore, they can work for longer, consume more and in general be a boost to the economy.