The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fada'il)
Muslim :: Book 30 : Hadith 5807
Ammar, the freed slave of Banu Hashim, reported that Ibn 'Abbas said that Allah's Messenger (may peace be upon him) died when he had attained the age of sixty-five.