白发苍苍

Explanation: Gray: gray. Describe the gray hair of old age 　　Usage: The main predicate; as predicate, adverbial; more white hair used to refer to the elderly 　　Source: Han Yu Tang, "the essays in": "I is not forty years, and as the vast, white-haired, teeth and shake." Thesaurus:  Aifashuairong, Snow Cang Yan, Beard and hair Are all white