Virtues and Merits of the Prophet (pbuh) and his Companions

Bukhari :: Book 4 :: Volume 56 :: Hadith 746

Narrated Hariz bin 'Uthman:

That he asked 'Abdullah bin Busr (i.e. the companion of the Prophet), "Did you see the Prophet when he was old?" He said, "He had a few white hairs between the lower lip and the chin."