A person who has attained the age of majority may be adopted without judicial authorization only when the adoptive parent is the spouse or the surviving spouse of a parent of the person to be adopted.
In other proposed adult adoptions, the court, upon the joint petition of the adoptive parent and the person to be adopted, may authorize the adoption of a person who has attained the age of majority if the court finds after a hearing that the adoption is in the best interest of both parties.