Start in 2000. That year, 469,029 people had New Zealand superannuation as a taxable income source (Source: Stats NZ, taxable-income-sources). Fewer than half a million. In a country of that size, it was a manageable number, and it was about to do something it has never done since.

It went down. In 2001 the count fell to 465,159, a drop of 3,870 people. That is the only year in the entire 24-year series where the number of superannuitants shrank. Every single year after it has gone up.

The early climb was gentle. It took until 2006 for the total to cross half a million, at 505,815. Then the maths of the post-war baby boom started to bite. The first boomers, born in 1946, turned 65 in 2011, the year the count hit 574,620. From there the milestones come faster and faster: 620,172 in 2013, 709,893 in 2017, 804,009 in 2021.

Look at how those gaps compress. Getting from 500,000 to 600,000 took roughly seven years. The next hundred thousand took four. The one after that took four as well. The most recent figures available, from 2024, put the total at 875,001.

The single biggest one-year increase was not in some distant projection. It was 2020, when the count rose by 26,958 in twelve months, from 755,910 to 782,868. Second place goes to 2023, at 24,324. The peak of this transition is not coming. It is here, and it has been for years.

Here is the number that reframes every argument about the affordability of the pension. Since 2011, New Zealand has added 300,381 superannuitants. That is about 74 percent of all the growth across the whole 24 years, packed into the last 13. Averaged out, roughly 440 more people a week, every week, for over a decade.

Make it personal. Think of a couple who both turned 65 in 2011 and have been drawing super since. In their first year, they were part of a group of 574,620. Their neighbours who turned 65 last year joined a group more than 300,000 larger. Same entitlement, same eligibility age, vastly more people relying on it. The money comes out of taxes collected now, from workers earning now.

The honest caveat: this series counts people with NZ superannuation as a taxable income source, which is not identical to a headcount of retired New Zealanders. Plenty of superannuitants also earn wages, and someone who receives even part of a year's payments shows up. The 2001 decline sits at the very start of the series, where early administrative or definitional quirks are hardest to rule out. And 2024 is the most recent year available, so nothing here tells you about 2025.

None of that changes the slope. My view is that the argument about whether New Zealand can afford superannuation has been overtaken by arithmetic that was locked in 79 years ago. The people are already born. Most of them are already collecting. The interesting question is not whether the bill grows. It is who gets asked to pay it.