Utah
Summary: Adults may be adopted with the same requirements as for child adoption except parental consent.
Most Relevant Utah Statute:
§ 78-30-1
78-30-1. Who may adopt -- Adoption of minor -- Adoption of adult.
(2) Any adult may be adopted by another adult. However, all provisions of this chapter apply to the adoption of an adult just as though the person being adopted were a minor, except that consent of the parents of an adult person being adopted is not required.