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AustraliaCommunity profile

Western Australia

Five year age groups

In 2021, the largest age group in Western Australia was 35 to 39 year olds. The group that changed the most since 1991 was 35 to 39 year olds, increasing by 200,904 people.

The Age Structure of Western Australia provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of Western Australia's residential role and function and how it is likely to change in the future.

Five year age groups present a classic age profile of the population. Each age group covers exactly five years, which enables direct comparison between each group.

To get a more complete picture Western Australia's Age Structure should be viewed in conjunction with Household Types and Dwelling Types.

Q:

Derived from the Census question:

'What is the person's date of birth or age?'

Age structure - Five year age groups
Western Australia - Total persons (Usual residence)20211991Change
Five year age groups (years)Number%Australia %Number%Australia %1991 to 2021
0 to 4161,7536.15.80----+161,753
5 to 9172,6546.56.20----+172,654
10 to 14171,3776.46.20----+171,377
15 to 19153,2635.85.70----+153,263
20 to 24158,8176.06.20----+158,817
25 to 29176,0456.67.00----+176,045
30 to 34196,3127.47.30----+196,312
35 to 39200,9047.67.20----+200,904
40 to 44178,5896.76.50----+178,589
45 to 49174,6326.66.40----+174,632
50 to 54173,6226.56.30----+173,622
55 to 59162,7786.16.10----+162,778
60 to 64150,6675.75.80----+150,667
65 to 69132,1865.05.10----+132,186
70 to 74115,1964.34.60----+115,196
75 to 7978,0122.93.20----+78,012
80 to 8453,1152.02.20----+53,115
85 and over50,1061.92.13,646100.0100.0+46,460
Total population2,660,028100.0100.03,646100.0100.0+2,656,382
Source: Australian Bureau of Statistics, Census of Population and Housing 1991 and 2021. Compiled and presented by .id (informed decisions).
Please refer to specific data notes for more information

Dominant groups

Analysis of the five year age groups of Western Australia in 2021 compared to Australia shows that there was a higher proportion of people in the younger age groups (under 15) and a lower proportion of people in the older age groups (65+).

Overall, 19.0% of the population was aged between 0 and 15, and 16.1% were aged 65 years and over, compared with 18.2% and 17.2% respectively for Australia.

There were no major differences between Western Australia and Australia in 2021.

Emerging groups

From 1991 to 2021, Western Australia's population increased by 2,656,382 people (72857.4%). This represents an average annual population change of 24.58% per year over the period.

The largest changes in age structure in this area between 1991 and 2021 were in the age groups:

  • 35 to 39 (+200,904 persons)
  • 30 to 34 (+196,312 persons)
  • 40 to 44 (+178,589 persons)
  • 25 to 29 (+176,045 persons)

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