Volume 4, Book 56, Number 748:
Narrated Anas:
Allah’s Apostle 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.