Neb. Rev. Stat. § 71-1133: Neb. Rev. Stat. § 71-1133

In the case of a juvenile in need of court-ordered custody and treatment, a petitioner may file a petition and begin proceedings under the Developmental Disabilities Court-Ordered Custody Act within ninety days before the juvenile's eighteenth birthday. No order under the act shall be effective until the subject reaches his or her eighteenth birthday.