Musnad Abu Ya'la al-Mawsili 115:61

Surayj narrated to us, Hisham narrated to us, some of our companions informed us, from Qatadah, from Anas, who said: The Messenger of Allah (peace be upon him) said: "The lifespan of my nation is between sixty and seventy, and the fewest of them are those who reach eighty."