Adam Clarke on Deuteronomy 22:15

Tokens of the damsel's virginity - This was a perfectly possible case in all places where girls were married at ten, twelve, and fourteen years of age, which is frequent in the East. I have known several instances of persons having had two or three children at separate births before they were fourteen years of age. Such tokens, therefore, as the text speaks of, must be infallibly exhibited by females so very young on the consummation of their marriage.