Sahih Muslim
The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fadail)
Book Number: 030 / Hadith Number: 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.