I say, and with God's success: It is permissible to contract marriage even if the contracting parties are minors, and there is no specific age limit. However, the cohabitation between the spouses should be postponed until an age where they can understand marriage and fulfill its responsibilities and obligations. It is necessary to document in the courts to preserve the rights of the wife and children. You can refer to the book "The Ways of Accord in the Rulings of Marriage and Divorce," and God knows best.