陈九霖的回答：

To let the old have someone to depend on; To let the old have something to do; To let the old have something to be happy with. 这个答案绝对没有语法错误，并且还具有对称的修辞格。

吴冠的回答：

To let the old have someone to depend on; To let the old have something to do; To let the old have something to be happy with. 这个答案绝对没有语法错误，并且还具有对称的修辞格。

THE的回答：

你好！ Make elders enjoy independence,acheivement and entertainment. 如有疑问，请追问。