My poor mother ! her hair has turned grey 可怜的妈妈，她的头发已变成花白的了。
3.
His hair has turned grey 他的头发花白了。
4.
The black hair has turned grey . so now it is time to conclude such negotiations . now for that there are conditions and possibilities 黑头发都谈成了白头发了，该结束这个谈判了。现在存在这种机遇。
