The custodian shall transfer in an appropriate manner the custodial property to the minor or to the minor's estate upon the earlier of: (1) the minor's attainment of 21 years of age with respect to custodial property transferred under 72-26-604 or 72-26-605; (2) the minor's attainment of 18 years of age with respect to custodial property transferred under 72-26-606 or 72-26-607; or (3) the minor's death.
Termination Of Custodianship
Mont. Code Ann. § 72-26-803, under Renunciation, Resignation, Death, or Removal of Custodian -- Accounting -- Termination -- Successor.
Mont. Code Ann. § 72-26-803