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Sahih Muslim Book 8. The Book of Marriage 
 
Book 008, Number 3310: 
'A'isha (Allah be pleased with her) reported: Allah's Apostle (may peace be upon him) married me when I was six years old, and I was admitted to his house when I was nine years old.

Sahih Muslim Book 8. The Book of Marriage 

Book 008, Number 3311: 

'A'isha (Allah be pleased with her) reported that Allah's Apostle (may peace be upon him) married her when she was seven years old, and he was taken to his house as a bride when she was nine, and her dolls were with her; and when he (the Holy Prophet) died she was eighteen years old.

Sahih Bukhari

Volume 7, Book 62, Number 64: 

Narrated 'Aisha: 

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).