Musnad Ahmad 435:98

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Abu Ishaq narrating from 'Amir ibn Sa'd al-Bajali, from Jarir, that he heard Mu'awiyah delivering a sermon, saying: "The Messenger of Allah, may Allah bless him and grant him peace, died while he was sixty-three years old. And Abu Bakr, may Allah be pleased with him, [died] while he was sixty-three years old. And 'Umar [died] while he was sixty-three years old. And I am sixty-three years old."