Anas (Radiallahu Anhu) reports:
“The Prophet (Peace and blessing be upon him) was neither tall nor was he short. In complexion, he was neither very white like lime, nor very dark, nor brown which results in darkness. The hair of the Prophet (Peace and blessing be upon him) was neither very straight nor very curly. When he attained the age of forty, Allah the Almighty granted him Prophethood. He lived for ten years in Makkah and in Madinah for ten years*. At that time there were not more than twenty white hair on his blessed head and beard.”
* This is just one of the narrations on the length of time the Prophet (peace be upon him) spent in Makkah and Madinah. The stronger opinion is that, after the revelation, he lived in Makkah for 10 years and Madina for 13 years.