(31) باب فِي صِفَةِ النَّبِيِّ صلى الله عليه وسلم وَمَبْعَثِهِ وَسِنِّهِ .
Anas b. Malik reported that Allah's Messenger (ﷺ) was neither very conspicuously tall nor short-statured, and his color was neither glaringly white nor brown; his hair was neither very curly nor very straight; Allah commissioned him (as a Prophet) when he had reached the age of forty years, and he stayed in Mecca for ten years and for ten years in Medina; Allah took him away when he had just reached the age of sixty, and there had not been twenty white hair in his head and beard.
Reference: Sahih Muslim 2347 a
In-book reference: Book 43, Hadith 147
USC-MSA web (English) reference(deprecated numbering scheme): Book 30, Hadith 5794