When a minor ward for whom a guardian has been appointed under the provisions of this Chapter or other laws of this State shall have attained his or her majority, and if incompetent shall be declared competent by the Bureau and by an order of the clerk of the superior court of the county in which such guardian was appointed, and when any incompetent ward, not a minor, shall be declared competent by said Bureau and by an order of the clerk of the superior court of the county in which such guardian was appointed, the guardian shall upon making a satisfactory accounting be discharged upon a petition filed for that purpose. The certificate of the Director, or his representative, setting forth the fact that an incompetent ward has been rated competent by the Bureau on examination in accordance with the laws and regulations governing such Bureau shall be prima facie evidence upon which the court may declare such ward competent. (1929, c. 33, s. 17; 1955, c. 1272, s. 3.)