National has confirmed it will campaign on lifting the retirement age, with leader Christopher Luxon saying the current system is "unworkable and unaffordable." But any changes will need bipartisan support, and currently that isn't looking likely. Treasury's December forecasts estimated the annual cost of superannuation will hit $30 billion by the end of the decade, so if the age isn't changed, what can be done to make sure superannuation remains affordable? Miles Workman is a senior economist at ANZ, he chats to Jesse.

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