【摘 要】
：
The aging of the population is one of the most significant challenges of the 21st century.It has been estimated that by the year 2025,the number of people above
【机 构】
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International Federation of Sports Medicine,University of Puerto Rico & Harvard Medical School,USA
论文部分内容阅读
The aging of the population is one of the most significant challenges of the 21st century.It has been estimated that by the year 2025,the number of people above age 60 in all the countries in the world will exceed one billion.Life expectancy continues to increase significantly in most countries of the world.In fact,in some countries,average life expectancy has exceeded 80 years,particularly among women.Further,the number of persons in the advanced age groups mayreach 25% of the total population of the world in the next 100 years.
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