Miss. Code Ann. § 43-21-263

(1) The youth court may order the sealing of records involving children: (a) if the child who was the subject of the cause has attained twenty (20) years of age; (b) if the youth court dismisses the cause; or (c) if the youth court sets aside an adjudication in the cause. (2) The youth court may, at any time, upon its own motion or upon application of a party to a youth court cause, order the sealing or unsealing of the records involving children.