Musnad Ahmad 435:46

Rawh narrated to us, Shu'bah narrated to us, he said: Abu Ishaq narrated to us, he said: I heard 'Amir ibn Sa'd saying: I heard Jarir ibn 'Abd Allah saying: I heard Mu'awiyah ibn Abi Sufyan saying while he was delivering a sermon: "The Messenger of Allah (may Allah bless him and grant him peace) passed away while he was sixty-three years old. And Abu Bakr (may Allah be pleased with him) passed away while he was sixty-three years old. And 'Umar passed away while he was sixty-three years old." Mu'awiyah said: "And I am today sixty-three."