Prime Minister John Key and Finance Minister Bill English remain adamant that the pension age will not be addressed on their watch.
Mr English said yesterday the issue of a rise in the age of eligibility was "a matter for a future government".
"New Zealand has just had a 30-year debate about retirement income."
It had settled on a universal pension, which not many other countries had, KiwiSaver, which comprised personal and government funds, and the New Zealand Superannuation Fund.
Mr Key has said he would resign from Parliament before increasing the age of eligibility.