The cost of superannuation had gone up form $8 billion to $11 billion in five years.
There were also challenges in funding health costs of an increasingly ageing population.
The position arrived at was also "important for Labour Party credibility."
Asked if he would have resigned as finance spokesman had the result bound him to stay with the age of 65, he said "I'm glad I didn't have to answer that question."
"It would have undermined me and Labour."
Mr Parker would not offer a view as to what Labour's actual policy will be next year.
The resolution passed today is expected to become part of Labour's new Policy Platform against which any future manifesto must be compatible.
The motion adopted was put up by the affiliated unions of the party and says: "Labour is committed to a system of universal superannuation. Labour will ensure the future sustainability of the system and will consider options to achieve this, including raising the age of eligibility. If this occurs, we will ensure that those who cannot work past 65 in their normal work and need the cover of superannuation will receive the equivalent of the superannuation payment from the age of 65."