The amount of money in your pocket is not just the result of how much you get paid, but how much the government decides to tax you or support you through income support, such as benefits, Working for Families payments and superannuation. These policies affect how much money you get. And how much everyone else does, too.
Since 1898, NZ has provided some kind of payment to older people, but the cost has increased with an ageing population. In 2001, the Super Fund was set up to save for superannuation in the future, but government payments into the fund have been suspended since 2009.