There is one certainty in this election of upsets, diversions and sudden career endings: Parliament will be younger. The under-40s will swell in number. So will the lower-40s.
Already there are 11 under-40 MPs: four in Labour, including its leader, four in National, two Greens and one in ACT.
On parties’ recent polling averages up to late August that would double to at least 21 — more than one-sixth of Parliament.