Musnad Abu Ya'la al-Mawsili 121:7

Yahya ibn Ayyub narrated to us, Ismail narrated to us, and he said: Rabiah informed me that he heard Anas ibn Malik saying: The Messenger of Allah (ﷺ) had hair that was neither completely straight nor curly and kinky. He was of a bright complexion, neither dark-skinned nor starkly white. He was of medium stature among the people, neither short nor excessively tall. He was sent [as a Prophet] at the age of forty. He stayed in Makkah for ten [years] and in Al-Madinah for ten [years]. He passed away at the age of sixty, and there were not twenty white hairs on his head and beard.