National's Christopher Luxon has committed to raising the age of superannuation should the party get into power.

The party intends to lift the age of eligibility from 65 to 67, despite a recent report from the Retirement Commission recommending the age stays the same.

The report says the commission has concerns that raising the age might disadvantage manual workers and groups with lower life expectancies, including Māori and Pasifika.

Luxon says increasing the age would be done gradually and the party was giving people 15-20 years' notice.

But it needs to be done, he told Morning Report.

"Every decade people live 1.3 years longer. It's not an unreasonable thing and other countries have already fully adopted 67 as a retirement age.

"It's the sensible, pragmatic, practical thing we have to do."

When asked, Luxon was unable to say how much money a person living alone on superannuation was paid a week.

But he says the amount and how they survived off it is a different issue.

"That gets us back to economic mismanagement in this country and why we need a strong economy that drives into higher wages and creates more wealth so we can actually afford to support people in a better way."

Raising the age is "the right thing to do" for the country.

There is going to be a rising level of cost, people are living longer and the country is struggling, he says.

"I've been the leader now for a year. Every quarter it has got worse, our economic outlook and conditions, and the government's done nothing to adjust."

-RNZ.