I agree with Dave.
Although the elderly do skew right that's far from the whole picture.
I am middle aged so my parents' generation are all late Silent Gen or Boomers. None of our parents and their friends are right-wing at all - some of them are still out there trying to save the forests and the oceans.
The people I know irl who voted for National or ACT are all younger - working age.
Edited to add: Anecdotes aside, pretty sure statistically we are seeing a resurgence of ACT that is driven by affluent young men, while there is also a contingent of disenfranchised working-class people who vote for Winston.