The same wikipedia cites a number of sources saying that Mohammed's wife Aisha was 6 when he married her (he was 53), and only 9 years old when he first fucked her.
http://en.wikipedia.org/wiki/Aisha#Young_marriage_age_controversy
Evidence that Aisha was nine when the marriage was consummated:
These traditions are from the hadith collections of Bukhari (d. 870) and Muslim b. al-Hajjaj (d. 875). These two collections are in general regarded as the most authentic by Sunni Muslims. This tradition is also found in Abu Dawud and Tabari.
Narrated 'Aisha: The prophet engaged me when I was a girl of six. We went to Medina and stayed at the home of Harith Kharzraj. Then I got ill and my hair fell down. Later on my hair grew (again) and my mother, Um Ruman, came to me while I was playing in a swing with some of my girl friends. She called me, and I went to her, not knowing what she wanted to do to me. She caught me by the hand and made me stand at the door of the house. I was breathless then, and when my breathing became all right, she took some water and rubbed my face and head with it. Then she took me into the house. There in the house I saw some Ansari women who said, "Best wishes and Allah's blessing and a good luck." Then she entrusted me to them and they prepared me (for the marriage). 5:58:234
Narrated 'Aisha: "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.) 8:73:151
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). 7:62:64 7:62:65 7:62:88 5:58:236
'A'isha (Allah be pleased with her) reported: Allah's Messenger (may peace be upon him) married me when I was six years old, and I was admitted to his house at the age of nine. She further said: We went to Medina and I had an attack of fever for a month, and my hair had come down to the earlobes. Umm Ruman (my mother) came to me and I was at that time on a swing along with my playmates. She called me loudly and I went to her and I did not know what she had wanted of me. She took hold of my hand and took me to the door, and I was saying: Ha, ha (as if I was gasping), until the agitation of my heart was over. She took me to a house, where had gathered the women of the Ansar. They all blessed me and wished me good luck and said: May you have share in good. She (my mother) entrusted me to them. They washed my head and embellished me and nothing frightened me. Allah's Messenger (, may peace be upon him) came there in the morning, and I was entrusted to him. 8:3309
'Aisha (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. 8:3310
Similar hadith are to be found in Abu Dawud. A version of this tradition can also be found in Tabari:
"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"......(The Prophet) married her three years before the Emigration, when she was seven years old and consummated the marriage when she was nine years old, after he had emigrated to Medina in Shawwal. She was eighteen years old when he died. (Tabari, Volume 9, p. 131, in the SUNY edition)
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Claims that Aisha was pubescent at nine years of age
Supporters of the hadith say that of course it is possible that girls are pubescent at nine, and adduce Islamic traditions alleging that girls as young as nine gave birth [2], [3], [4]., [5]. They claim that girls matured early in desert climates.
They point to traditions in other cultures allowing, or even encouraging, marriage at young ages. They insist that it is unfair to single out Muhammad in this regard, as if he were doing something shocking. None of the people of his time, or indeed for many centuries later, found anything shocking in his marriage to Aisha. They indignantly point to all of Muhammad's other marriages, to widows or divorcees who were in many cases older than he was, as proof that he could not have been a pedophile.
Claims that Aisha was pre-pubescent at nine years of age:
Many contemporary critics of Islam claim that Aisha was pre-pubescent and that Muhammad was engaging in child abuse and pedophilia in marrying her. See [6], [], [7], [8], [9]. Some critics have even accused Muhammad of showing sexual interest in other children [10], thus underlining the claim that he was a pedophile.