1 Since the year 2000, the population of people over the age of fifty in the United
States has rapidly increased, while the number of people under the age of fifty has
remained relatively stable. 2 There are two reasons for this rapid aging of our society.
3 The first is the baby boom that began in the late 1940s. 4 With the end of World War
II, men and women quickly settled into family life and, by 1965, had some 75 million
babies. 5 This enormous population boom led to the youth culture of the 1960s. 6 And
as the baby boomers continue to age, they will produce an "elder boom" which is
expected to peak around 2025. 7 The second explanation for the aging of our society is
increasing life expectancy. 8 Improvements in medicine and nutrition have resulted in
people living longer than ever. 9 Newborns today can expect to live thirty years longer
than those born in 1900. 10The sharp and recent increase in the number of elderly
people here and around the world-supports the surprising fact that more than half
of all the elderly people who have ever lived are alive today.
6. The main idea is expressed in sentence]
A. 1.
B. 2.
C. 3.