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