While I support Sue Bradford's effort to lower the voting age to 16, unfortunately, it seems she forgot something. That something is s268 of the Electoral Act 1993, which entrenches certain clauses of the Act against amendment or repeal except with the approval of either 75% of Parliament or a referendum. Among the protected clauses are:
Section 74 of this Act, and the definition of the term “adult” in section 3(1) of this Act, and section 60(f) of this Act, so far as those provisions prescribe 18 years as the minimum age for persons qualified to be registered as electors or to vote
These are of course the exact clauses part 2 of Bradford's bill seeks to amend. So, unless she can get a 75% majority of the House (which in practice means the support of both National and Labour), her bill as it stands is a non-starter.
Fortunately, with the bill not even in the ballot yet, it can be re-written. The obvious change would be to amend it to provide for a referendum (the appropriate provisions can be lifted from the Electoral Referendum Act 1993, or from Keith Locke's Head of State Referenda Bill), with a contingent commencement clause similar to that used in the Electoral Act. This has the sour note of having people voting on other people's voting rights, which is no more acceptable in the case of young persons as it would have been in the case of women, but if its the only way to do it, its the only way to do it.
(Hat tip: Graeme)