(a) The board of directors of a noxious weed control district is composed of five persons, each of whom must:
(1) hold title to land located in the district;
(2) be 18 years of age or older; and
(3) reside in a county all or part of which is located in the district.
(b) Except as provided by Section 78.032 of this code, the term of office of a director is two years.