Australians are getting older. They are also flocking to Victoria and Queensland, and away from every other state and territory.
Data from the Bureau of Statistics shows Australia's population is continuing to age, with implications for health budgets, the size of the working-age population, housing and demand for skilled labour.
Since 1995, the proportion of Australia's population aged 65 years or older has jumped from 11.9 per cent to 15 per cent. 
Over the same period, the proportion aged under 15 years has fallen from 21.5 per cent to 18.8 per cent.
The median age of Australians - the age at which half the population is older and half is younger - has increased from 34 years to 37 years.
The ABS data also shows the number of people aged 100 or older has jumped 254 per cent in the past two decades.
There are now 4440 centenarians in Australia, up 550 in the past 12 months, with more than three times as many females (3400) as males (1000) in this age group.
And as the population ages it is also growing more slowly.
Over the past 20 years, comparing the working-age population (aged 15 to 64 years) with the remainder of the population (aged 0 to14 and 65 and greater), the non working-age population has grown faster, at 1.5 per cent against 1.4 per cent for the working-age population.
The faster growth in the non-working ages has been especially evident since 2010.
The main contributor has been growth in the population aged 65 and over.
Academics warned last month that these huge demographic changes would result in a shortfall of about 28,500 detached houses in Sydney and 19,000 in Melbourne by 2022.
They said younger households would confront an "unprecedented squeeze" in the housing markets of both cities because their increasing numbers would butt up against huge growth in the number of older households because of population ageing.
Meanwhile, the ABS data also shows how Australians are moving around the country.
It shows only Victoria and Queensland recorded net interstate migration gains in the year ended   June 30, 2015.
Victoria continued a recent trend of recording the highest net gain, with 10,200 people, up from 8800 people in the year ended   June 30, 2014.
Queensland had a gain of 6400 people, up from 5800 in the previous year.
Over the same period, net losses from interstate migration were recorded in NSW (6600 people),  South Australia (3800 ), the Northern Territory (3000), Western Australia (2000), the ACT (700) and Tasmania (500).
NSW still has the largest population, with 7,618,241 people. Victoria comes second with 5,938,119, followed by Queensland (4,779,400) and Western Australia (2,591,585).
But Melbourne's population is projected to overtake the population of Sydney by 2036. 
The bureau estimates there are now 23,781,200 people in Australia, after an increase of 317,100 since   June 2014, a growth rate of just 1.4 per cent.
The contribution to population growth for the year ended   June 30, 2015 was higher from net overseas migration (53 per cent) than from natural increase (47 per cent).
The original version of this story said Victoria's population was projected to overtake the population of NSW by 2036, which is incorrect.
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