Musannaf Ibn Abi Shaybah 36124 — Book of History

It is narrated from Sa'id bin al-Musayyib (may Allah have mercy on him) that the Qur'an began to be revealed to the Prophet (peace and blessings be upon him) at the age of forty-three. He stayed in Makkah for ten years and in Madinah for ten years, and when he (peace and blessings be upon him) passed away, his blessed age was sixty-three years.