白头而新

Explanation: Although the intersection is not that long and close friend, the same as knowledge. With the "bald as new." 　　Source: Ming Yang Shen, "bald and the new": "" Han Dynasty ": 'bald as new, Qinggai before.'" Said park "as 'old age and the new, Qinggai and so'. 'And', 'like' ancient character general. whiteheads and new, though still to the old and make new. " Thesaurus:  to remain aloof from each other though associated till the hair is white Antonym Group:  hate Bosom friend evening, hate Meet evening, bosom friend to regret that something happened too late, regret not to have known sb. before, acquaintance to regret that something happened too late