Delaware Governor  Carney signed into law a bill that sets the minimum age for marriage at 18, making Delaware the first state in the US to ban child marriage outright. Previously, a child of any age could have married in Delaware with a judge’s approval.The ban has already taken effect, and Delaware is now unique as the only state where those under 18 cannot marry under any circumstances. All 49 other US states and the District of Columbia allow children to marry under certain conditions, usually through parental consent or approval from a judge