Aisha, taking all known accounts and records of Aisha's age at marriage, estimates of her age range from nine to 19.
Firstly, for Muslims, Muhammad > humanity, and if Allah said so, then it is so.
His first, Khadijah, was 15yrs his senior, the rest of his wives were divorcees, age of expectancy was 28, Aisha remains the foremost scholar of Islam who led men in war and her age is most likely told down incorrect.
"Women, in hot climates, are marriageable at eight, nine, or ten years of age; thus, in those countries, infancy and marriage generally go together. They are old at twenty: their reason therefore never accompanies their beauty." — Montesquieu, 1700 \["spirit of laws" Book 16, PG. 264-5\]
A book which heavily influenced the "founding fathers" in their writing of the constitution because he was a renowned atheist lawyer. Oh and in the same Book, PG. 264 he asserts: "It is hardly to be believed that God, who is a wise Being, should place a soul, especially a good soul, in such a black ugly body.”
“Mahomet married Cadhisja at five, and took her to his bed at eight years old. In the hot countries of Arabia and the Indies, girls are marriageable at eight years of age, and are brought to bed the year after.” —Humphrey Prideaux, Life of Mahomet.
Well, he confused “Cadhisja”(khadija) with “Aisha”.