Sunan an-Nasa'i, Volume 4, Book 26, Hadith 3260 (DarusSalam) ⓘ
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: Hadith 3258 (Reference) & Book 26, Hadith 63 (In-Book)