Australia's fertility rate fell to a record low of 1.48 children per woman in 2024, well below the 2.1 replacement rate needed to sustain a population without immigration. Elon Musk responded to the data with a blunt two-word assessment on his social media platform X: "They are disappearing."
The exchange, reported by the Daily Mail, began when right-wing podcaster Katie Miller posted a clip from Australia's 7News along with her own commentary. Miller wrote that the country had "hit the lowest rate in history at 1.48, well below the 2.1 replacement rate." She added a sharp observation about the shift in maternal age:
"The average age of mothers was 25 in 1971, and now it's 32. This is a human catastrophe."
Musk, who has 14 children of his own, replied with his terse warning. It was not his first remark on Australia's demographic trajectory. Back in April, he posted that "Australians are becoming an endangered species."
Whether you find Musk's language provocative or plainly descriptive, the numbers behind it are not in dispute. And they tell a story that extends far beyond one country's borders.
The latest data from the Australian Bureau of Statistics recorded 292,318 registered births in 2024, a 1.9 percent increase from 2023. But a slight uptick in raw births did not prevent the fertility rate from falling to its lowest point on record. The median age for mothers stood at 32.1 years. For fathers, it was 33.9.
The Australian Institute of Family Studies provided the longer view. The institute stated that Australia's total fertility rate has been below replacement level since 1976, nearly fifty years running.
"Since 1976, Australia's total fertility rate has been below replacement level (about 2.1 births per woman). Replacement level is the level at which a population is replaced from one generation to the next without immigration."
That definition matters. Australia's population continues to grow by 1.6 percent each year, but three quarters of that growth comes from immigration, not births. The population officially passed 28 million last Tuesday, according to the ABS Population Clock. The country is getting bigger, but not because Australians are having more children.
Musk has built a sprawling portfolio of ventures from electric vehicles to space exploration, and his public commentary often ranges well beyond business. He drew crowds in Beijing during a recent state visit, underscoring his global profile. His demographic warnings, though, touch something more fundamental than commerce or geopolitics.
The timeline is striking. Australia's birth rate peaked at 3.55 children per woman in 1961, the same year the contraceptive pill was introduced. From 1961 to 1971, nearly half of all mothers had their first child between the ages of 20 and 24.
That world is gone. Before 1981, only 15 percent of women who had children did so at age 30 or older. By 2020, that figure had reached 53 percent.
The Australian Institute of Family Studies attributed the shift to several forces working in tandem:
"The fall in the fertility rates for those in their teens and twenties has also been influenced by social changes such as increased participation in formal schooling and tertiary education by young people, women's increased labour force participation and changes in family-related values and attitudes."
In other words, the decline is not a mystery. Women are spending more years in school and in the workforce. Cultural expectations around motherhood have shifted. And the economics of raising children have grown more punishing.
Gabby Campbell, a mother of two featured in the 7News segment, put it plainly. She said she would "love to have a third" child but found the prospect "too expensive." That is not an abstract policy complaint. It is a household calculation millions of families make every day.
Not everyone sees the falling birth rate as a crisis. Tanya Williams, author of "A Childfree Happily Ever After," appeared in the same 7News report and framed the trend as liberation.
"I saw what the traditional life looked like and I decided it just wasn't for me. I think it's just been a really great thing for women in general to know that they have got a choice and there are women out there like them that don't necessarily want to have children."
Williams's perspective is genuine, and individual freedom is not something conservatives dismiss lightly. But there is a difference between respecting personal choice and celebrating a civilizational trend that, left unchecked, hollows out the tax base, strains pension systems, and leaves a nation dependent on immigration to fill the gap.
Musk has faced no shortage of legal and business challenges in recent years. A San Francisco jury found he misled shareholders ahead of his $44 billion Twitter acquisition, and he has tangled with other tech leaders over everything from artificial intelligence to government spending.
Yet on demographics, Musk keeps returning to the same theme. He is not alone. Across the developed world, birth rates are falling below replacement level. Australia just happens to offer an especially clean data set, and an especially stark trajectory.
The Centre for Population, an Australian government body, expects things to get worse before they get better. Its projections show the total fertility rate falling to 1.45 children per woman by the end of 2025 and to 1.42 by the end of 2026.
The Centre does project a partial recovery to 1.62 children per woman by the end of 2032. But even that optimistic number remains well below the 2.1 replacement threshold. It would still leave Australia dependent on immigration for the majority of its population growth.
That dependency creates its own political pressures. When three quarters of population growth comes from abroad, questions about assimilation, housing, infrastructure, and labor markets intensify. Governments find themselves managing immigration not as a supplement to organic growth but as a substitute for it.
Other billionaires have weighed in on related policy debates. Jeff Bezos, for instance, recently backed a government efficiency push even as he clashed with officials over tax policy. The intersection of private wealth and public governance is a recurring feature of the current era.
Australia's experience mirrors what is happening in Japan, South Korea, much of Europe, and increasingly in the United States. The details vary. The direction does not. Societies that grow wealthier, more educated, and more urbanized tend to have fewer children, sometimes far fewer.
The policy responses range from cash bonuses for new parents to subsidized childcare to tax incentives. Few have reversed the trend. The deeper issue, as the Australian Institute of Family Studies acknowledged, involves "changes in family-related values and attitudes", a force no government check can easily counteract.
The private space industry offers an unintentional metaphor. Companies like SpaceX and its competitors, including Blue Origin, pour billions into reaching new frontiers. But the most consequential frontier may be the one closest to home: whether developed nations can sustain themselves from one generation to the next.
Campbell, the mother of two who wanted a third child, did not need a demographic briefing to understand the problem. She did the math at her kitchen table and came up short. Multiply her story by millions and you have Australia's fertility curve, and much of the Western world's.
Musk's posts are characteristically blunt. "They are disappearing" is not a nuanced policy paper. But it captures something the data supports: a country whose birth rate peaked at 3.55 in 1961 and has now fallen to 1.48 is on a path that cannot be sustained by births alone.
Australia's population still grows. Its economy still functions. But the engine of that growth has shifted from families to immigration, a trade-off with consequences that compound over decades.
The Australian Institute of Family Studies noted the trend "reflects the trend of women delaying having a first child." Delay, in demographic terms, often becomes decline. A woman who has her first child at 32 instead of 25 has fewer childbearing years ahead. The math is unforgiving.
None of this means individual women are making wrong choices. It means the collective result of millions of rational individual decisions, driven by cost, culture, and institutional incentives, can produce an outcome no one chose and no one can easily reverse.
A civilization that treats children as an optional lifestyle accessory rather than its own future will eventually discover the difference. Australia's numbers suggest the lesson is arriving ahead of schedule.
