Sunan an-Nasa'i, Hadith 3258 ⓘ
It was narrated from 'Aishah that the Messenger of Allah married her when she was nine and he died when she was eighteen years old.
أَخْبَرَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، وَأَحْمَدُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، تَزَوَّجَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم وَهِيَ بِنْتُ تِسْعٍ وَمَاتَ عَنْهَا وَهِيَ بِنْتُ ثَمَانِيَ عَشْرَةَ .
also referenced under: Book 26, Hadith 63 (In-Book) & Volume 4, Book 26, Hadith 3260 (DarusSalam)