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City of KnoxPopulation forecast

Wantirna

Population and age structure

Between 2021 and 2031, the age structure forecasts for Wantirna indicate a 3.5% increase in population under working age, a 3.8% increase in population of retirement age, and a 17.2% increase in population 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 the City of Knox 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
Wantirna - Total persons202120312046Change between 2021 and 2046
Age group (years)Number%Number%Number%Number
0 to 47985.68285.19515.1+153
5 to 99676.79616.01,1326.1+165
10 to 149256.49966.21,1636.3+238
15 to 197815.41,0156.31,1586.2+377
20 to 247645.39696.01,0985.9+334
25 to 296904.88795.51,0155.5+325
30 to 348956.21,0716.71,2276.6+331
35 to 391,0787.51,2627.91,4828.0+404
40 to 441,0267.11,2487.81,5028.1+476
45 to 498956.21,1317.01,3917.5+496
50 to 548475.99756.11,2316.6+384
55 to 598175.78605.31,1086.0+291
60 to 649156.47944.99935.3+78
65 to 699436.67104.48484.6-96
70 to 748155.77104.47063.8-108
75 to 794713.36794.25883.2+118
80 to 843472.45453.44832.6+136
85 and over3982.84422.85232.8+125
Total persons14,372100.016,075100.018,597100.0+4,225
Source: Population and household forecasts, 2021 to 2046, prepared by .id (informed decisions), June 2023.

Key findings

In 2021, the dominant age structure for persons in Wantirna was ages 35 to 39, which accounted for 7.5% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 45 to 49, which is expected to increase by 236 and account for 7.0% of the total persons.

The largest 5 year age group in 2031 is 35 to 39 years, with a total of 1,262 persons.

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