(68) باب الْجَعْدِ
Narrated Anas bin Malik:
The Prophet (ﷺ) was neither conspicuously tall, nor short; neither, very white, nor tawny. His hair was neither much curled, nor very straight. Allah sent him (as an Apostle) at the age of forty (and after that) he stayed for ten years in Mecca, and for ten more years in Medina. Allah took him unto Him at the age of sixty, and he scarcely had ten white hairs on his head and in his beard.
Reference: Sahih al-Bukhari 5900
In-book reference: Book 77, Hadith 117
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 72, Hadith 787