America is growing older. Fifty-eight years ago, only 4 out of every 100 people in the United States were 65 or older. Today, 10 out of every 100 Americans are over 65. The aging (变老) of the population will affect (影响) American society in many ways — education, medicine, and business. Quietly, the aging of America has made us a very different society — one in which people have a quite different idea of what kind of behavior (行为) is suitable (合适) at various ages.
A person’s age no longer tells you anything about his/her social position, marriage or health. There’s no longer a particular year in which one goes to school or goes to work or gets married or starts a family. The social clock that kept us on time and told us when to go to school, get a job, or stop working isn’t as strong as it used to be. It doesn’t surprise us to hear of a 29-year-old university president or a 35-year-old grandmother, or a 70-year-old man who has been a father for the first time. Public ideas are changing.
Many people say, “I am much younger than my mother — or my father — was at my age.” No one says “Act your age” any more. We’ve stopped looking with surprise at older people who act in youthful ways.
64. According to the passage, the aging of the population in America _____.
A. has made people feel younger
B. has changed people’s social position
C. has changed people’s understanding of age
D. has slowed down the country’s social development
65. The underlined word “one” refers to _____.
A. a society                  B. a person                   C. a place                     D. population
66. If a 25-year-old man becomes general manager of a big firm, the writer of the text would most probably consider it _____.
A. normal                    B. wonderful                C. unbelievable             D. surprising