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.  

كَانَ رِجَالٌ مِنَ الأَعْرَابِ جُفَاةً يَأْتُونَ النَّبِيَّ ﷺ فَيَسْأَلُونَهُ مَتَى السَّاعَةُ فَكَانَ يَنْظُرُ إِلَى أَصْغَرِهِمْ فَيَقُولُ إِنْ يَعِشْ هَذَا لاَ يُدْرِكْهُ الْهَرَمُ حَتَّى تَقُومَ عَلَيْكُمْ سَاعَتُكُمْ قَالَ هِشَامٌ يَعْنِي مَوْتَهُمْ  

If he lives he would not grow very old that he would find your Last Hour coming to you (he would see you dying).  

كَانَ الأَعْرَابُ إِذَا قَدِمُوا عَلَى رَسُولِ اللَّهِ ﷺ سَأَلُوهُ عَنِ السَّاعَةِ مَتَى السَّاعَةُ فَنَظَرَ إِلَى أَحْدَثِ إِنْسَانٍ مِنْهُمْ فَقَالَ إِنْ يَعِشْ هَذَا لَمْ يُدْرِكْهُ الْهَرَمُ قَامَتْ عَلَيْكُمْ سَاعَتُكُمْ