The Prophet ﷺ engaged me when I was a girl of six (years). We went to Medina and stayed at the home of Bani-al-Harith bin Khazraj. Then I got ill and my hair fell down. Later on my hair grew (again) and my mother, Um Ruman, came to me while I was playing in a swing with some of my girl friends. She called me, and I went to her, not knowing what she wanted to do to me. She caught me by the hand and made me stand at the door of the house. I was breathless then, and when my breathing became Allright, she took some water and rubbed my face and head with it. Then she took me into the house. There in the house I saw some Ansari women who said, "Best wishes and Allah's Blessing and a good luck." Then she entrusted me to them and they prepared me (for the marriage). Unexpectedly Allah's Apostle came to me in the forenoon and my mother handed me over to him, and at that time I was a girl of nine years of age.  

تَزَوَّجَنِي النَّبِيُّ ﷺ وَأَنَا بِنْتُ سِتِّ سِنِينَ فَقَدِمْنَا الْمَدِينَةَ فَنَزَلْنَا فِي بَنِي الْحَارِثِ بْنِ خَزْرَجٍ فَوُعِكْتُ فَتَمَرَّقَ شَعَرِي فَوَفَى جُمَيْمَةً فَأَتَتْنِي أُمِّي أُمُّ رُومَانَ وَإِنِّي لَفِي أُرْجُوحَةٍ وَمَعِي صَوَاحِبُ لِي فَصَرَخَتْ بِي فَأَتَيْتُهَا لاَ أَدْرِي مَا تُرِيدُ بِي فَأَخَذَتْ بِيَدِي حَتَّى أَوْقَفَتْنِي عَلَى باب الدَّارِ وَإِنِّي لأَنْهَجُ حَتَّى سَكَنَ بَعْضُ نَفَسِي ثُمَّ أَخَذَتْ شَيْئًا مِنْ مَاءٍ فَمَسَحَتْ بِهِ وَجْهِي وَرَأْسِي ثُمَّ أَدْخَلَتْنِي الدَّارَ فَإِذَا نِسْوَةٌ مِنَ الأَنْصَارِ فِي الْبَيْتِ فَقُلْنَ عَلَى الْخَيْرِ وَالْبَرَكَةِ وَعَلَى خَيْرِ طَائِرٍ فَأَسْلَمَتْنِي إِلَيْهِنَّ فَأَصْلَحْنَ مِنْ شَأْنِي فَلَمْ يَرُعْنِي إِلاَّ رَسُولُ اللَّهِ ﷺ ضُحًى فَأَسْلَمَتْنِي إِلَيْهِ وَأَنَا يَوْمَئِذٍ بِنْتُ تِسْعِ سِنِينَ  

That the Prophet ﷺ said to her, "You have been shown to me twice in my dream. I saw you pictured on a piece of silk and some-one said (to me). 'This is your wife.' When I uncovered the picture, I saw that it was yours. I said, 'If this is from Allah, it will be done."  

أَنَّ النَّبِيَّ ﷺ قَالَ لَهَا أُرِيتُكِ فِي الْمَنَامِ مَرَّتَيْنِ أَرَى أَنَّكِ فِي سَرَقَةٍ مِنْ حَرِيرٍ وَيَقُولُ هَذِهِ امْرَأَتُكَ فَاكْشِفْ عَنْهَا فَإِذَا هِيَ أَنْتِ فَأَقُولُ إِنْ يَكُ هَذَا مِنْ عِنْدِ اللَّهِ يُمْضِهِ  

Khadija died three years before the Prophet ﷺ departed to Medina. He stayed there for two years or so and then he married ʿAisha when she was a girl of six years of age, and he consumed that marriage when she was nine years old.  

تُوُفِّيَتْ خَدِيجَةُ قَبْلَ مَخْرَجِ النَّبِيِّ ﷺ إِلَى الْمَدِينَةِ بِثَلاَثِ سِنِينَ فَلَبِثَ سَنَتَيْنِ أَوْ قَرِيبًا مِنْ ذَلِكَ وَنَكَحَ عَائِشَةَ وَهْىَ بِنْتُ سِتِّ سِنِينَ ثُمَّ بَنَى بِهَا وَهْىَ بِنْتُ تِسْعِ سِنِينَ