In 2023 it considered itself 25 years old (construction started in 1998)
https://www.skystadium.co.nz/fanzone/news/single/sky-stadium-awarded-3-green-star-performance-rating
But, yes, it's getting on but not done yet. I'm assuming it's not going to see 50 simply because it was built with light weight materials and fairly cheaply. I remember a few years ago the council commissioned a study into putting a roof on it and they concluded that they would have to demolish the stadium and rebuild it as it was built to do what it does and didn't have much margin.
https://www.skystadium.co.nz/fanzone/news/single/sky-stadium-awarded-3-green-star-performance-rating
But, yes, it's getting on but not done yet. I'm assuming it's not going to see 50 simply because it was built with light weight materials and fairly cheaply. I remember a few years ago the council commissioned a study into putting a roof on it and they concluded that they would have to demolish the stadium and rebuild it as it was built to do what it does and didn't have much margin.