23

　　. They wear out, and as a result, we get old and

　　24

　　die.

　　Even though we can’t live forever, we are living a

　　25

　　life than ever before. In 1900, the average American life span (寿命) was only 47 years, but today it is 75 years!

　　When does old age begin then? Sixty-five may be out-of-date as the

　　26

　　line between middle age and old age. After all, many older people don’t begin to experience physical and mental

　　27

　　until after age 75.

　　People are living longer because more people

　　28

　　childhood. Before modern medicine changed the laws of nature, many children died of common childhood

　　29

　　. Now that the chances of dying

　　30

　　are much lower, the chances of living long are much higher due to better diets and health care.

　　On the whole, our population is getting older. The

　　31

　　in our population will have lasting effects on our social development and our way of life. Some people fear such changes will be for the worse, while some see

　　32

　　, not disaster, many men and women in their “golden years” are healthy, still active, and young in

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