The Prophet ﷺ wrote the (marriage contract) with ʿAisha while she was six years old and consummated his marriage with her while she was nine years old and she remained with him for nine years (i.e. till his death).  

عَنْ عُرْوَةَ تَزَوَّجَ النَّبِيُّ ﷺ عَائِشَةَ وَهْىَ ابْنَةُ سِتٍّ وَبَنَى بِهَا وَهْىَ ابْنَةُ تِسْعٍ وَمَكَثَتْ عِنْدَهُ تِسْعًا  

'A'isha (Allah be pleased with her) reported that Allah's Apostle ﷺ married her when she was six years old, and he (the Holy Prophet) took her to his house when she was nine, and when he (the Holy Prophet) died she was eighteen years old  

تَزَوَّجَهَا رَسُولُ اللَّهِ ﷺ وَهْىَ بِنْتُ سِتٍّ وَبَنَى بِهَا وَهْىَ بِنْتُ تِسْعٍ وَمَاتَ عَنْهَا وَهْىَ بِنْتُ ثَمَانَ عَشْرَةَ  

"The Messenger of Allah married me when I was six, and consummated the marriage with me when I was nine."  

تَزَوَّجَنِي رَسُولُ اللَّهِ ﷺ وَهِيَ بِنْتُ سِتِّ سِنِينَ وَبَنَى بِهَا وَهِيَ بِنْتُ تِسْعٍ  

Abdullah said: “The Prophet married Aishah when she was seven years old, and consummated the marriage with her when she was nine, and he passed away when she was eighteen.”  

تَزَوَّجَ النَّبِيُّ ﷺ عَائِشَةَ وَهِيَ بِنْتُ سَبْعٍ وَبَنَى بِهَا وَهِيَ بِنْتُ تِسْعٍ وَتُوُفِّيَ عَنْهَا وَهِيَ بِنْتُ ثَمَانِي عَشْرَةَ سَنَةً