Australia feels crowded. Yet beneath the growth lies an uncomfortable fact: Australia’s population have not been replacing themselves for half a century. Almost all of Australia’s growth now arrives on a plane — and the countries those arrivals come from are, one by one, are running out of young people too.
This is a story about a number most people never see, and why it may blindside us.
Australia’s fertility rate has been below the 2.1 “replacement” line since 1976, falling to 1.48 in 2024 — the lowest in the century-long record. Each generation is now smaller than the one before it, before we count anyone arriving from overseas.
Natural increase, births minus deaths, has been shrinking, sliding from 146,000 in 2015 to just 104,000 in 2023 as deaths climb toward births. Net overseas migration, by contrast, now towers over it, reaching 538,000 in the year to June 2023. The exception: when borders shut in 2021, net migration turned negative (-85,000), a preview of an Australia forced to rely on a natural increase that is itself fading.
Low fertility is no longer a rich-country phenomena. China and South Korea sit near or below one child per woman; even India has slipped under replacement. Bubbles drift down (fewer babies) and right (older populations) together. The only places with a youth surplus — Niger, Nigeria, Pakistan — sit in the world’s lowest-income regions.
The fastest-growing migrant communities in Australia come overwhelmingly from countries that are themselves below replacement. India added the most residents of any group over the decade — and India has now slipped under 2.1. China, near one child per woman, has among the lowest fertility on Earth. As these countries age, their own incentive to retain young workers rises, and the global pool of mobile young people shrinks. This could result in serious economic issues in the future.
The ABS’s own projections make the dependence stark. With zero net migration, Australia’s population peaks around 2036 and then begins to fall. Every other future — low, medium or high — is really a migration future. Australia keep growing only by competing, ever harder, for a global supply of young people that is quietly disappearing. The blindside is not that migration is too high or too low. It is that we have built our future on a resource the rest of the world is about to start fighting over.
Australian Bureau of Statistics. (2024). Births, Australia, 2024. https://www.abs.gov.au/statistics/people/population/births-australia/latest-release
Australian Bureau of Statistics. (2024). Deaths, Australia, 2024. https://www.abs.gov.au/statistics/people/population/deaths-australia/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
Australian Bureau of Statistics. (2025). Australia’s population by country of birth, June 2025. https://www.abs.gov.au/statistics/people/population/australias-population-country-birth/latest-release
Australian Bureau of Statistics. (2025). Overseas migration, 2024–25 financial year. https://www.abs.gov.au/statistics/people/population/overseas-migration/latest-release
Harvard Chan Bioinformatics Core. (n.d.). Reproducible reports with R Markdown. Retrieved June 6, 2026, from https://hbctraining.github.io/Training-modules/Rmarkdown/lesson.html
Kabacoff, R. (n.d.). Modern data visualization with R: Interactive graphs. Retrieved June 7, 2026, from https://rkabacoff.github.io/datavis/Interactive.html
Language Technology and Data Analysis Laboratory. (2026). Interactive data visualization in R. Retrieved June 7, 2026, from https://ladal.edu.au/tutorials/interactive_viz/interactive_viz.html
Our World in Data. (2024). Median age, Children born per woman (total fertility rate), and Population (with UN projections) [Data sets]. Based on UN World Population Prospects 2024. https://ourworldindata.org/
RStudio. (n.d.). Getting started with RPubs. Retrieved June 10, 2026, from https://rpubs.com/about/getting-started
Plotly. (n.d.). Plotly R open source graphing library. Retrieved June 7, 2026, from https://plotly.com/r/
STEM Data Visualisation. (n.d.). Adding interactivity. The University of Melbourne. Retrieved June 5, 2026, from https://data-visualisation.stem.melbourne/adding-interactivity
STEM Data Visualisation. (n.d.). Multivariate strategies. The University of Melbourne. Retrieved June 5, 2026, from https://data-visualisation.stem.melbourne/multivariate-strategies
Tidyverse. (n.d.). Packages. Retrieved June 7, 2026, from https://www.tidyverse.org/packages/
United Nations, Department of Economic and Social Affairs, Population Division. (2024). World population prospects 2024. https://population.un.org/wpp/