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LEARN MORE ABOUT .idIn 2021, the largest age group in St Kilda was 30 to 34 year olds. The group that changed the most since 1991 was 30 to 34 year olds, increasing by 896 people.
The Age Structure of St Kilda provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of St Kilda'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 St Kilda'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 | |||||||
|---|---|---|---|---|---|---|---|
| St Kilda - Total persons (Enumerated) | 2021 | 1991 | Change | ||||
| Five year age groups (years) | Number | % | City of Port Phillip % | Number | % | City of Port Phillip % | 1991 to 2021 |
| 0 to 4 | 645 | 3.0 | 4.1 | 708 | 4.1 | 4.6 | -63 |
| 5 to 9 | 493 | 2.3 | 3.7 | 509 | 3.0 | 3.6 | -16 |
| 10 to 14 | 461 | 2.2 | 3.6 | 415 | 2.4 | 3.3 | +45 |
| 15 to 19 | 496 | 2.3 | 3.3 | 723 | 4.2 | 4.8 | -227 |
| 20 to 24 | 1,283 | 6.1 | 5.7 | 1,923 | 11.2 | 10.6 | -640 |
| 25 to 29 | 2,992 | 14.1 | 11.1 | 2,480 | 14.5 | 13.0 | +512 |
| 30 to 34 | 3,063 | 14.5 | 11.8 | 2,166 | 12.6 | 11.8 | +896 |
| 35 to 39 | 2,398 | 11.3 | 10.1 | 1,546 | 9.0 | 8.6 | +852 |
| 40 to 44 | 1,649 | 7.8 | 7.9 | 1,312 | 7.6 | 7.5 | +336 |
| 45 to 49 | 1,494 | 7.0 | 7.4 | 906 | 5.3 | 5.5 | +588 |
| 50 to 54 | 1,410 | 6.7 | 7.0 | 786 | 4.6 | 4.6 | +624 |
| 55 to 59 | 1,326 | 6.3 | 6.0 | 704 | 4.1 | 4.1 | +621 |
| 60 to 64 | 1,182 | 5.6 | 5.2 | 692 | 4.0 | 4.2 | +490 |
| 65 to 69 | 809 | 3.8 | 4.1 | 698 | 4.1 | 4.0 | +111 |
| 70 to 74 | 686 | 3.2 | 3.6 | 590 | 3.4 | 3.4 | +95 |
| 75 to 79 | 397 | 1.9 | 2.5 | 498 | 2.9 | 2.9 | -102 |
| 80 to 84 | 244 | 1.2 | 1.6 | 315 | 1.8 | 2.0 | -72 |
| 85 and over | 167 | 0.8 | 1.4 | 183 | 1.1 | 1.5 | -17 |
| Total population | 21,195 | 100.0 | 100.0 | 17,162 | 100.0 | 100.0 | +4,033 |
Dominant groups
Analysis of the five year age groups of St Kilda in 2021 compared to the City of Port Phillip shows that there was a lower proportion of people in the younger age groups (under 15) as well as a lower proportion of people in the older age groups (65+).
Overall, 7.5% of the population was aged between 0 and 15, and 10.9% were aged 65 years and over, compared with 11.4% and 13.2% respectively for the City of Port Phillip.
The major differences between the age structure of St Kilda and the City of Port Phillip were:
- A larger percentage of persons aged 25 to 29 (14.1% compared to 11.1%)
- A larger percentage of persons aged 30 to 34 (14.5% compared to 11.8%)
- A smaller percentage of persons aged 5 to 9 (2.3% compared to 3.7%)
- A smaller percentage of persons aged 10 to 14 (2.2% compared to 3.6%)
Emerging groups
From 1991 to 2021, St Kilda's population increased by 4,033 people (23.5%). This represents an average annual population change of 0.71% per year over the period.
The largest changes in age structure in this area between 1991 and 2021 were in the age groups:
- 30 to 34 (+896 persons)
- 35 to 39 (+852 persons)
- 20 to 24 (-640 persons)
- 50 to 54 (+624 persons)
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