squeak,
While at one time we married off women as young as three years old, today we require couples to be at least bar and bat mitzvah age, and also old enough to marry under secular law. And in most of the US that means at least age 16 even with parental consent, 18 without. (That hasn’t always been the law; my father’s first cousin got married without her parents knowledge at age 17. The marriage lasted over 67 years until her husband died.)