Irrelevant Gnome, the Hadith written immediately after the Prophet's death from testimony taken by those who knew the Prophet. The Hadith however are classified with a sort of quality control into:

sahih - Authentic

hasan - Good

da'if - Weak


Sahih al-Bukhari states that Aisha narratated that the Prophet married her when she was six years old and he consummated his marriage when she was nine years old, and then she remained with him for nine years (i.e., till his death).Sahih al-Bukhari, 7:62:64

Aisha had an important role in early Islamic history, both during Muhammad's life and after his death. In Sunni tradition, Aisha is thought to be scholarly and inquisitive. She contributed to the spread of Muhammad's message and served the Muslim community for 44 years after his death. She is also known for narrating 2210 hadiths, not just on matters related to the Prophet's private life, but also on topics such as inheritance, pilgrimage, and eschatology.

As commentator on the Prophet's private life it should come as no surprise whatsoever that her accounts would be considered by the faithful to be totally authentic and unimpeachable.