No person shall be eligible to serve as a member of the senate unless the person has been a resident of the State for not less than three years, has attained the age of majority and is, prior to filing nomination papers and thereafter continues to be, a qualified voter of the senatorial district from which the person seeks to be elected; except that in the year of the first general election following reapportionment, but prior to the primary election, an incumbent senator may move to a new district without being disqualified from completing the remainder of the incumbent senator's term. No person shall be eligible to serve as a member of the house of representatives unless the person has been a resident of the State for not less than three years, has attained the age of majority and is, prior to filing nomination papers and thereafter continues to be, a qualified voter of the representative district from which the person seeks to be elected; except that in the year of the first general election following reapportionment, but prior to the primary election, an incumbent representative may move to a new district without being disqualified from completing the remainder of the incumbent representative's term.