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City of CockburnCommunity profile

Treeby

Five year age groups

In 2021, the largest age group in Treeby was 30 to 34 year olds. The group that changed the most since 2016 was 30 to 34 year olds, increasing by 584 people.

The Age Structure of Treeby provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of Treeby'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 Treeby'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
Treeby - Total persons (Usual residence)20212016Change
Five year age groups (years)Number%Spearwood %Number%Spearwood %2016 to 2021
0 to 445810.85.7939.95.8+365
5 to 92275.44.9535.65.2+174
10 to 141754.14.7384.14.6+137
15 to 191483.54.6535.65.1+95
20 to 242686.36.59610.36.0+171
25 to 2947211.26.614515.47.5+327
30 to 3469716.57.811212.06.8+584
35 to 3946711.17.09510.26.6+371
40 to 442756.55.8535.77.2+221
45 to 491724.16.4464.96.6+126
50 to 541573.76.7555.95.8+101
55 to 591553.75.9313.46.6+123
60 to 64962.36.3283.15.6+67
65 to 691433.45.1252.75.9+118
70 to 741393.35.791.04.5+130
75 to 79721.74.10--3.8+72
80 to 84561.33.120.33.0+53
85 and over491.23.20--3.3+49
Total population4,226100.0100.0941100.0100.0+3,285
Source: Australian Bureau of Statistics, Census of Population and Housing 2016 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 Treeby in 2021 compared to Spearwood 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, 20.4% of the population was aged between 0 and 15, and 10.9% were aged 65 years and over, compared with 15.3% and 21.1% respectively for Spearwood.

The major differences between the age structure of Treeby and Spearwood were:

  • A larger percentage of persons aged 30 to 34 (16.5% compared to 7.8%)
  • A larger percentage of persons aged 0 to 4 (10.8% compared to 5.7%)
  • A larger percentage of persons aged 25 to 29 (11.2% compared to 6.6%)
  • A larger percentage of persons aged 35 to 39 (11.1% compared to 7.0%)

Emerging groups

From 2016 to 2021, Treeby's population increased by 3,285 people (349.1%). This represents an average annual population change of 35.04% per year over the period.

The largest changes in age structure in this area between 2016 and 2021 were in the age groups:

  • 30 to 34 (+584 persons)
  • 35 to 39 (+371 persons)
  • 0 to 4 (+365 persons)
  • 25 to 29 (+327 persons)

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