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City of Port PhillipPopulation forecast

St Kilda

Population and age structure

Between 2021 and 2026, the age structure forecasts for St Kilda indicate a 27.8% increase in females under working age, a 62.5% increase in females of retirement age, and a 16.9% increase in females of working age.

Knowledge of how the age structure of the population is changing is essential for planning age-based facilities and services, such as child care, recreation and aged care.

The forecast age groups of City of Port Phillip is a function of the current age of the population (people aging each year, being born and dying) as well as the age of people migrating into and out of the area. This in turn is driven by location (fringe, city centre, regional or rural) the existing housing stock (separate dwellings, medium or high density), the amount and type of new residential development (same as existing stock, or diversifying) and where the area is in a cycle of change. We call this the area’s residential role and function. You can learn more about this in the section household and suburb life cycles.

Forecast age structure - 5 year age groups
St Kilda - Total females202120262041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 43383.15234.05663.9+228
5 to 92242.12582.03682.5+145
10 to 142232.12221.73112.1+88
15 to 192602.44023.14262.9+165
20 to 247256.71,1879.01,1738.1+448
25 to 291,64615.32,06815.72,06314.2+418
30 to 341,55814.41,78513.51,83012.6+271
35 to 391,22311.31,1999.11,2768.8+53
40 to 447997.49377.19536.6+154
45 to 497476.97845.98656.0+118
50 to 547276.77305.57885.4+61
55 to 596466.07085.47475.1+100
60 to 645935.56354.86704.6+76
65 to 693953.75364.15834.0+188
70 to 743313.13882.95403.7+209
75 to 791561.43312.54723.3+316
80 to 841191.11961.54102.8+291
85 and over760.72992.34763.3+400
Total persons10,787100.013,187100.014,517100.0+3,731
Source: Population and household forecasts, 2021 to 2041, prepared by .id (informed decisions), November 2022.

Key findings

In 2021, the dominant age structure for females in St Kilda was ages 25 to 29, which accounted for 15.3% of the total females.

The largest increase in females between 2021 and 2026 is forecast to be in ages 20 to 24, which is expected to increase by 461 and account for 9.0% of the total females.

The largest female 5 year age group in 2026 is 25 to 29 years, with a total of 2,068 females.

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