Average Ages per School Year in Australia

Ages and Years of Schooling for Australian Children in 2016

The average ages of Year 3 children in Australia, at the time of the 2016 annual NAPLAN tests (May 2016), were:

State / Territory	Average age	Years of schooling	Average Age starting school
NSW	8yrs 6mths	3yrs 4mths	5yrs 2mths
Vic	8yrs 8mths	3yrs 4mths	5yrs 4mths
Qld	8yrs 5mths	3yrs 4mths	5yrs 1mths
WA	8yrs 4mths	3yrs 4mths	5yrs 0mths
SA	8yrs 6mths	3yrs 4mths	5yrs 2mths
Tas	8yrs 10mths	3yrs 4mths	5yrs 6mths
ACT	8yrs 7mths	3yrs 4mths	5yrs 3mths
NT	8yrs 5mths	3yrs 4mths	5yrs 1mths

and they had each completed 3 years and 4 months of Schooling, at that time.
The ages per State were all similar for year 5 and year 7, but there is one noticeable change for the Year 9 group in 2016
This would be due to Queensland not having had a year of schooling before year 1 in the earlier years, with the average age of a year 9 student in Queensland having started schooling at an about 5 years and 11 months, while it is now an average of 5 years and 1 month.

Year 9 children

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State / Territory	Average age	Years of schooling	Average Age starting school
NSW	14yrs 7mths	9yrs 4mths	5yrs 3mths
Vic	14yrs 9mths	9yrs 4mths	5yrs 5mths
Qld	14yrs 3mths	8yrs 4mths	5yrs 11mths
WA	14yrs 4mths	9yrs 4mths	5yrs 0mths
SA	14yrs 6mths	9yrs 4mths	5yrs 2mths
Tas	14yrs 10mths	9yrs 4mths	5yrs 6mths
ACT	14yrs 7mths	9yrs 4mths	5yrs 3mths
NT	14yrs 5mths	9yrs 4mths	5yrs 1mths

Average Age starting school in Australia

State / Territory	Average Age starting school
NSW	5yrs 2mths
Vic	5yrs 4mths
Qld	5yrs 1mths
WA	5yrs 0mths
SA	5yrs 2mths
Tas	5yrs 6mths
ACT	5yrs 3mths
NT	5yrs 1mths