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The Prophet wrote the (marriage contract) with 'Aisha while she was six years old and consummated his marriage with her while she was nine years old and she remained with him for nine years (i.e. till his death). (Sahih Bukhari 7.88)."
Read the full text here."I used to play with the dolls in the presence of the Prophet, and my girl friends also used to play with me. When Allah's Apostle used to enter (my dwelling place) they used to hide themselves, but the Prophet would call them to join and play with me. (
The playing with the dolls and similar images is forbidden, but it was allowed for 'Aisha at that time, as she was a little girl, not yet reached the age of puberty.)" (Fateh-al-Bari page 143, Vol.13)
Read the full text here"
The Prophet engaged me when I was a girl of six (years)." (Sahih Bukhari 5.234)
Read the full text hereWikipedia writes:
"Aisha was six or seven years old when betrothed to Muhammad. She stayed in her parents' home until the age of nine, when the marriage was consummated." (Watt, 'Aisha', Encyclopedia of Islam Online)
http://en.wikipedia.org/wiki/Aisha