白首同归

Explanation: Return: merger, the end result. Until the hair white, interests remain congenial. Describe the long-term friendship, and always. After the use of "white first end", said the elderly are also death. 　　Source: Pan Yue Jin "poetry collection Valley," Who does not admire Chunrong, cold of winter, alone good hope; cast stone points to send friends, with the return of white first. " 　　Examples: When the king ~ day, when I go alone, Castle Peak. ★ Tang Bai "nine things and a sense of November 11 as" poetry