Musannaf Ibn Abi Shaybah 39307 — Reports on how old the Prophet

It is narrated from Sa'id that the Qur'an began to be revealed to the Prophet (peace and blessings be upon him) when his (peace and blessings be upon him) blessed age was forty-three years, and he (peace and blessings be upon him) resided for ten years in Makkah and ten years in Madinah. And he (peace and blessings be upon him) passed away when his (peace and blessings be upon him) age was sixty-three years.