Musnad Ahmad 25:179

Yahya narrated to us, from Hisham, from Ikrimah, from Ibn Abbas: "It was revealed to the Prophet, may Allah bless him and grant him peace, while he was forty-three years old. He remained in Makkah for ten [years], and in Al-Madinah for ten [years], and he was taken [in death] while he was sixty-three years old."