Why do you always focus on muhammad (peace be upon him) and Aisha (peace be upon her)? How about Mary (peace be upon her) who carried Jesus at the age of 12 in her womb and was betrothed? How about British kings and queens?
How about the age of consent in the 'new world' in the 1800s? Or facts like I mentioned about British age of consent as plea by women for women abuses in India in the British Empire, child prostitution being a prelavent problem in the British Empire being the sole reason for making the age of consent 18. Not 15, 16, 17, 19, 20, but 18 because some man said so.
Even Romeo and Juliet? How old was Juliet when her mother says stop playing with dolls you should be married with children? Yes a fiction, but a reflection of society at large, so not fiction.