This question is based on �Literary Appreciation'O'let us have him, for his silver hairs will purchase us a good opinion and buy men's voices to commend our...

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In the excerpt, "his silver hairs" refers to old age. The speaker is saying that they should include this older man in their plans because his age and experience will give them a good reputation and make others praise their actions. The reference to his "silver hairs" is a poetic way of describing his advanced age and the respect that comes with it. It suggests that he has lived a long life and gained wisdom, and his presence will add gravity and credibility to their endeavors.