Sahih Muslim Book 30, Hadith Number 5797.

Chapter : The qualities of Allah’s Apostle (may peace be upon him) and age when he was given the ministry of apostlehood and the duration of his life.

‘Aisha reported that Allah’s Messenger (may peace be upon him) died when he had attained the age of sixty-three. And a hadith like this had been transmitted on the authority of Sa’id b. Musayyib.