Aisha was 6 when they married and 9 when her 53 year old husband cosummated the marriage, but so what. Muhammed was a poor camel jockey hired by a wealthy twice widowed caravan owner, 15 years older than him. Love ruled and the 41 year old Khajida married the 26 year old Muhammaed. A few years later he had his first vision and she became his first convert. She was his only wife until she died at the age of 65 and after that he took 11 more wives, including a current wife of his stepson. The 6 year old was wife #3. If the moneybags Khajida had outlived the prophet, it's very doubtful that polygamy would have become a popular Muslim tradition.