Prime Minister Scott Morrison this afternoon announced the federal government would make the vaccine available to all people in that age group across the country on August 30.
Bookings are not yet available but are expected to come online next week.
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"The cabinet met today to affirm that we will be moving to opening up 16- to 39-year-olds for the balance of the program," Mr Morrison said.
"I want to stress, do not make a booking yet. We will advise when bookings can be made. It isn't today."
He said the government was also waiting for further advice from ATAGI on vaccinating children aged 12 to 15.
"I want to assure parents in particular, vaccinating children is something we take really seriously and we do it very carefully," he said.
"We are making sure that we have the right advice and we can put the right plans in place and move on those vaccinations in the safest and most effective way possible."
More to come.