Musannaf Ibn Abi Shaybah 36128 — Book of History

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) was sent as a prophet at the age of forty. He stayed in Makkah for fifteen years and in Madinah for ten years, and at the time of his death he was sixty-five years old.