Jami` at-Tirmidhi Book 49, Hadith 50
"The Prophet (ﷺ) died when he was sixty-three years old."
that he heard Mu'awiyah bin Abi Sufyan giving a Khutbah, saying: "The Messenger of Allah (ﷺ) died when he was sixty-three years old, and so did Abu Bakr and 'Umar, and I am sixty-three years old."
that the Messenger of Allah (ﷺ) said: "I free myself of the friendship of every Khalil, and if I were to take a Khalil then I would have taken Ibn Abi Quhafah as a Khalil. And indeed your companion is Allah's Khalil."