Allah's Messenger (ﷺ) was neither very tall nor short, neither absolutely white nor deep brown. His hair was
neither curly nor lank. Allah sent him (as an Apostle) when he was forty years old. Afterwards he
resided in Mecca for ten years and in Medina for ten more years. When Allah took him unto Him,
there was scarcely twenty white hairs in his head and beard.
Sahih al-Bukhari Book 61, Hadith 57