Hadithcore
Sahih Muslim, 2348
sahih

Anas b. Malik reported that Allah's Messenger (ﷺ) died when he was sixty-three years old, and so was the case with Abu Bakr, and so was the case with Umar who was also sixty-three (when he died).

حَدَّثَنِي أَبُو غَسَّانَ الرَّازِيُّ، مُحَمَّدُ بْنُ عَمْرٍو حَدَّثَنَا حَكَّامُ بْنُ سَلْمٍ، حَدَّثَنَا عُثْمَانُ، بْنُ زَائِدَةَ عَنِ الزُّبَيْرِ بْنِ عَدِيٍّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قُبِضَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَهُوَ ابْنُ ثَلاَثٍ وَسِتِّينَ وَأَبُو بَكْرٍ وَهُوَ ابْنُ ثَلاَثٍ وَسِتِّينَ وَعُمَرُ وَهُوَ ابْنُ ثَلاَثٍ وَسِتِّينَ ‏.‏

References2 variants
In-Book Reference
Book 43, Hadith 149
USC-MSA web (English) reference
Book 30, Hadith 5796 (deprecated numbering scheme)