'A'isha reported that Messenger of Allah ﷺ died when he had attained the age of sixty-three. And a hadith like this had been transmitted on the authority of Sa'id b. Musayyib.
أَنَّ رَسُولَ اللَّهِ ﷺ تُوُفِّيَ وَهُوَ ابْنُ ثَلاَثٍ وَسِتِّينَ سَنَةً وَقَالَ ابْنُ شِهَابٍ أَخْبَرَنِي سَعِيدُ بْنُ الْمُسَيَّبِ بِمِثْلِ ذَلِكَ