Anas ibn Malik (ra) reports: “Allah’s Messenger (Allah bless him and give him peace) was neither very tall of stature, nor short. His skin was neither pale white, nor tawny, and his hair was neither crisply curled, nor lank. Allah (Exalted is He) sent him at the end of forty years of life, so he stayed in Mecca for ten years and in Medina for ten years, and Allah took him unto Himself at the end of sixty years, with fewer than twenty white hairs on his head and his beard.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو رَجَاءٍ قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ سَمِعَهُ، يَقُولُ: كَانَ رَسُولُ اللهِ صلى الله عليه وسلم، لَيْسَ بِالطَّوِيلِ الْبَائِنِ، وَلاَ بِالْقَصِيرِ، وَلاَ بِالأَبْيَضِ الأَمْهَقِ، وَلاَ بِالآدَمِ، وَلاَ بِالْجَعْدِ الْقَطَطِ، وَلاَ بِالسَّبْطِ، بَعَثَهُ اللَّهُ تَعَالَى عَلَى رَأْسِ أَرْبَعِينَ سَنَةً، فَأَقَامَ بِمَكَّةَ عَشْرَ سِنِينَ، وَبِالْمَدِينَةِ عَشْرَ سِنِينَ، وَتَوَفَّاهُ اللَّهُ تَعَالَى عَلَى رَأْسِ سِتِّينَ سَنَةً، وَلَيْسَ فِي رَأْسِهِ وَلِحْيَتِهِ عِشْرُونَ شَعَرَةً بَيْضَاءَ.
sunnah.com