Yahya related to me from Malik that Rabia ibn Abi Abd ar-Rahmanheard Anas ibn Malik say, "The Messenger of Allah, may Allah bless himand grant him peace, was not excessively tall or short. He was notvery pallid nor dark. He did not have curly hair or lank hair. Allahcommissioned him at the age of forty. He stayed in Makka ten years andat Madina for ten years and Allah the Mighty, the Majestic made himdie when he was sixty. There were not twenty white hairs in his hairor beard, may Allah bless him and grant him peace."
USC-MSA web (English) reference: Book 49, Hadith 1
Arabic reference: Book 49, Hadith 1674