According to Sunni scriptural Hadith sources, Aisha was six or seven years old when she was married to Muhammad and nine when the marriage was consummated.[11][12][13][14][10][21] For example, Sahih al-Bukhari, considered by many Sunni Muslims as the most authentic book after Quran, states:

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).

—Sahih al-Bukhari, 7:62:64
http://en.wikipedia.org/wiki/Aisha#Age_at_marriage