Musnad Abu Ya'la al-Mawsili 121:6

Abu Ja'far Muhammad ibn Yusuf al-Ghadidi narrated to us, Abdullah ibn Wahb narrated to us, from Qurrah, that Rabi'ah ibn Abi Abd al-Rahman narrated to him that he witnessed a gate of Baqi' al-Gharqad. He was sitting behind a group of people among whom was Anas ibn Malik. He said: I heard him mentioning the description of the Messenger of Allah, may Allah bless him and grant him peace. Among what he mentioned was that he said: "The Messenger of Allah, may Allah bless him and grant him peace, was made a prophet when he was forty years old. He remained in Makkah for ten [years] and in al-Madinah for ten [years]. He passed away when he was sixty years old, and there were not twenty white hairs on his head and beard."