From Sahih Bukhari (Hadith 5134):
Narrated `Aisha:that the Prophet (ﷺ) married her when she was six years old and he consummated his marriage when she was nine years old. Hisham said: I have been informed that `Aisha remained with the Prophet (ﷺ) for nine years (i.e. till his death)
Reference: Bukhari 5134