In this Act,—
(a) “minor” means a person who has not completed the age of eighteen years;
(b) “guardian” means a person having the care of the person of a minor or of his property or of both his person and property, and includes—
(i) a natural guardian;
(ii) a guardian appointed by the will of the minor’s father or mother;
(iii) a guardian appointed or declared by a court; and
(iv) a person empowered to act as such by or under any enactment relating to any Court of wards;
(c) “natural guardian” means any of the guardians mentioned in section 6.