(42) باب سَكَرَاتِ الْمَوْتِ
Narrated `Aisha:
Some rough bedouins used to visit the Prophet (ﷺ) and ask him, "When will the Hour be?" He would look at the youngest of all of them and say, "If this should live till he is very old, your Hour (the death of the people addressed) will take place." Hisham said that he meant (by the Hour), their death.
Reference: Sahih al-Bukhari 6511
In-book reference: Book 81, Hadith 100
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 76, Hadith 518