Old age has always been thought of as the worst age to be; but it is not 接下条necessary for the old to be unhappy.然后分析一下AS的用法,

Old age has always been thought of as the worst age to be; but it is not 接下条
necessary for the old to be unhappy.然后分析一下AS的用法,

老年一直被视为最糟糕的年龄.但是老人们也没有必要因年老而怏怏不乐.
think of + sb/sth + as...= regard...as...