"I think the superannuation thing is a distraction from what we're dealing with over the next 10 years.
"We believe it is sustainable for the foreseeable future and the far bigger challenge is growing the New Zealand economy, growing exports.
"The reality is that if our GDP grows strongly over the next 10 or 15 years there will be a lot more choices for those sorts of issues for our older generations further out."
In Auckland, former National Party leader Don Brash was telling the Institute of Accountants that New Zealand had a bigger challenge than any other OECD country except Japan in controlling government debt.
"And that challenge relates to a significant degree to the ageing of our population, and the Government's refusal to take even the first and most obvious step to start dealing with that situation, namely flagging the inevitability of an increase in the age of eligibility for New Zealand Superannuation."
Dr Brash said it was a tragedy Parliament couldn't reach a broad consensus on the issue, as the Labour Party had recognised the inevitability of the change.
During this week's Budget debate, Labour leader David Shearer said: "Superannuation is something that John Key puts his fingers in his ears and whistles Dixie about, but I tell you what, in three years the entire superannuation budget will be larger than the education budget in this country."