From Bukhari vol. 7, #65:
“Narrated Aisha that the prophet wrote the marriage contract with 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 for nine years (i.e. till his death).””
From the Hadith of Sahih Muslim, Vol 2, #3309
Aisha reported: Allah’s Messenger married me when I was six years old, and I was admitted to his house at the age of nine….
From Abu Dawud, Vol. 2, #2116:
“Aisha said, “The Apostle of Allah married me when I was seven years old.” (The narrator Sulaiman said: “Or six years.”). “He had intercourse with me when I was 9 years old.”
From Tabari, volume 9, page 131
“Then the men and women got up and left. The Messenger of God consummated his marriage with me in my house when I was nine years old. Neither a camel nor a sheep was slaughtered on behalf of me”.