Nauru

There shall be a Parliament of Nauru. (Art. 26)

Subject to this Constitution, Parliament may make laws for the peace, order and good Government of Nauru; ... (Art. 27)

(1) Parliament shall consist of eighteen members or such greater number as is prescribed by law.
(2) For the purpose of the election of members of Parliament, Nauru shall be divided into constituencies.
(3) Unless otherwise prescribed by law, the constituencies and the number of members of Parliament to be returned by each of the constituencies are those described in the Second Schedule.
… (Art. 28)

Members of Parliament shall be elected in such manner as is prescribed by law, by Nauruan citizens who have attained the age of twenty years. (Art. 29)

A person is qualified to be elected a member of Parliament if, and is not so qualified unless, he-
(a) is a Nauruan citizen and has attained the age of twenty years; and
(b) is not disqualified under this Constitution. (Art. 30)