Australia’s population is still growing, but that headline hides a quieter demographic shift. Fertility has fallen below replacement level, natural increase is weakening, and migration is carrying more of the country’s population growth (Australian Bureau of Statistics [ABS], 2024; ABS, 2025). These five charts show why Australia’s future challenge is not only how many people it has, but how its population is changing.
Australia’s fertility rate has been below the replacement level of 2.1 births per woman for decades (ABS, 2024). This long-term fall matters because lower fertility slowly reshapes the age structure of the population, even when total population numbers continue to rise.
Low fertility does not immediately stop population growth. Australia can still grow when net overseas migration is high. Since the mid-2000s, migration has often contributed more to population growth than natural increase, showing why headline population growth can hide a weaker birth-driven population base (ABS, 2025).
The ABS produces multiple population projection scenarios based on different assumptions about fertility, life expectancy and migration. The medium series is the central projection. The contrast between the medium series and no-migration scenario highlights how dependent future population growth is on migration rather than births alone (ABS, 2024).
The population is not just growing; it is changing shape. Comparing 2022 with 2071 shows a clear shift: older Australians become a larger share of the population, while the working-age share shrinks (ABS, 2024).
The final question is not only how many older Australians there will be, but how many working-age people will support each older Australian. By 2071, the projected support ratio is much lower than in 2022 (ABS, 2024).
Australia’s demographic challenge is not simply about whether the total population continues to grow. The deeper issue is the structure of that growth. Fertility has remained below replacement level for decades, meaning births alone are no longer enough to maintain long-term population momentum. Net overseas migration has helped mask this shift by sustaining overall population growth, but projection scenarios show how different Australia’s future could look if migration were reduced. At the same time, the population is ageing. Older Australians are projected to make up a larger share of the population, while the working-age share becomes smaller. This creates a long-term policy challenge for healthcare, aged care, workforce planning and the tax base. The story behind the numbers is therefore not population collapse, but a demographic turning point hidden behind headline growth.
Australian Bureau of Statistics. (2025). Births, Australia, 2024. https://www.abs.gov.au/statistics/people/population/births-australia/latest-release
Australian Bureau of Statistics. (2026). National, state and territory population, September 2025. https://www.abs.gov.au/statistics/people/population/national-state-and-territory-population/latest-release
Australian Bureau of Statistics. (2024). Population projections, Australia, 2022 (base)–2071. https://www.abs.gov.au/statistics/people/population/population-projections-australia/latest-release
OpenAI. (2026). ChatGPT [Large language model]. https://chatgpt.com/
Generative AI was used to support planning, editing and refinement of this data visualisation project. ChatGPT was used to help brainstorm narrative structure, improve chart titles, refine written explanations, troubleshoot R code, and review whether the work aligned with the assignment rubric. The datasets, chart selections, interpretation, coding decisions and final submission were checked and controlled by me.