It is narrated from Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Do not race ahead of me in bowing and prostration, for when I prostrate you catch up with me when you rise, and when I bow you catch up with me when you rise. Indeed, I have grown heavy with age."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16912