'Abdullah b. Umar reported that Allah's Messenger (ﷺ) led us 'Isha' prayer at the latter part of the night and when he had concluded it by salutations he stood up and said:

Have you seen this night of yours? At the end of one hundred years after this none would survive on the surface of the earth (from amount my Companions). Ibn Umar said: People were (not understanding) these words of the Messenger of Allah (ﷺ) which had been uttered pertaining to one hundred years. Allah's Messenger (ﷺ) in fact meant (by these words) that on that day none from amongst those who had been living upon the earth (from amongst his Companions) would survive (after one hundred years) and that would be the end of this generation.

حَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالَ مُحَمَّدُ بْنُ رَافِعٍ حَدَّثَنَا وَقَالَ عَبْدٌ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، أَخْبَرَنِي سَالِمُ بْنُ عَبْدِ اللَّهِ، وَأَبُو بَكْرِ بْنُ سُلَيْمَانَ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ صَلاَةَ الْعِشَاءِ فِي آخِرِ حَيَاتِهِ فَلَمَّا سَلَّمَ قَامَ فَقَالَ ‏

‏ أَرَأَيْتَكُمْ لَيْلَتَكُمْ هَذِهِ فَإِنَّ عَلَى رَأْسِ مِائَةِ سَنَةٍ مِنْهَا لاَ يَبْقَى مِمَّنْ هُوَ عَلَى ظَهْرِ الأَرْضِ أَحَدٌ ‏

‏ ‏.‏ قَالَ ابْنُ عُمَرَ فَوَهَلَ النَّاسُ فِي مَقَالَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم تِلْكَ فِيمَا يَتَحَدَّثُونَ مِنْ هَذِهِ الأَحَادِيثِ عَنْ مِائَةِ سَنَةٍ وَإِنَّمَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لاَ يَبْقَى مِمَّنْ هُوَ الْيَوْمَ عَلَى ظَهْرِ الأَرْضِ ‏.‏ أَحَدٌ يُرِيدُ بِذَلِكَ أَنْ يَنْخَرِمَ ذَلِكَ الْقَرْنُ ‏.‏