Results of Australia's latest population survey (officially called a "census") show many changes in our profile since national statistics were last published, in 2017.
The information is collected by the Australian Bureau of Statistics every five years, and it's made public about 12 months later.
The latest data shows that the millennial generation (25-39 years old) will soon be larger than the baby boomers (55-74), each with over 5.4 million people, and 21.5 per cent of the total population of almost 25.5 million (twice that of 50 years ago). Generation X (40-54) was the third-biggest group, at over 19 per cent.
The typical Australian millennial today is a woman in her late 30s, with a partner and children, living in their own home, with an income of A$ 150,000 (€100,000) per year. In comparison, average annual earnings in Australia are A$ 90,790. Almost half of millennials are not religious, and many live in high-rise apartments, not houses.
For the first time, Australia has more than a million single-parent (80 per cent mum-only) families. And in answer to a new question in the survey, two million Australians said they had long-term health problems, including mental illness.
Nearly half of Australians have at least one parent born overseas, while one quarter were born internationally. India is now the third-largest country of birth, behind Australia and the UK. And of non-English languages spoken by family members, Punjabi had the biggest increase.
Mandarin, though, is still the most common foreign language used at home, followed by Arabic, Vietnamese and Cantonese. Similarly, the top five non-Christian religions are Islam, Hinduism, Buddhism, Sikhism and Judaism.
Christianity is the most widely professed religion in Australia but, with 44 per cent active followers, the number of believers is decreasing. Almost as many people said they had no religion. One hundred years ago, 97 per cent of Australians identified as Christian; 50 years ago, 86 per cent.
Philosophers and serious religious writers agree that the age of reason (starting in 1685) helped put the desires of individuals above all else. We wanted science, evidence and logic to explain the universe, not the mystery of a higher power.
Some things, however, haven't changed. Almost 80 per cent of the population live in the eastern states, where Sydney is still the biggest city (5.2 million). Two thirds of Australians live in capital cities and one third in the regions and small towns.
And, significantly in the digital age, 96 per cent of homes completed the population survey, eight out of ten electronically.