题目内容：
(61)How often be hears children wishing they were grown-up,and old people wishing they were young again．(62)Each age has its pleasures and its pains,and the happiest person is the onewho enjoys what each age gives him without wasting his time in useless regrets．
(63)Youth is a time when there are few tasks to make life difficult．But a child had his paind；he is not so free to do what he wishes to do；he is continually being told not to do things，or being punished for what he has done wrong·
(64)When the young man starts to earn his own living,he can no longer expect others to pay for his food．his clothes，and his room，but has to work if he wants to live comfortably．(65)If hespends most of his time playing about in the way that he used to as a child,he will go hungry．
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