Musannaf Ibn Abi Shayba 36:86

Ibn ‘Uyaynah narrated to us, from al-Zuhri, who heard Anas saying: The Messenger of Allah (may Allah bless him and grant him peace) arrived in Medina while I was ten years old, and he was taken (in death) while I was twenty years old. My mothers used to urge me to serve him.