白首如新

Explanation: Although the intersection is not that long and close friend, the same as knowledge. With the "bald as new." 　　Source: Su Song, "to be Sun Quan Cao A Book": "The ancients have Yanyue: 'white first as new, Qinggai before.' Introduction to the body Trustee shall _select_ the security. Mendelssohn, as the servant, not at this size of Xi Shi Zai, especially to the public are not the pretext. "