Musannaf Ibn Abi Shayba 37:451

Abu Usama narrated to us, from Hisham, from his father, from Aisha, who said: When the Bedouins would come to the Messenger of Allah (may Allah bless him and grant him peace), they would ask him, "When is the Hour?" He would look at the youngest person among them and say, "If this one lives, he will not reach old age before your Hour comes upon you."