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Northern Beaches CouncilPopulation forecast

Balgowlah Heights - Clontarf

Population and age structure

Between 2021 and 2031, the age structure forecasts for Balgowlah Heights - Clontarf indicate a 13.2% decrease in population under working age, a 46.8% increase in population of retirement age, and a 6.9% decrease 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 Northern Beaches Council 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
Balgowlah Heights - Clontarf - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 41653.12264.32444.5+79
5 to 94678.73827.24087.6-60
10 to 1459411.14568.64969.2-98
15 to 194799.04638.74368.1-43
20 to 243316.23596.73065.7-25
25 to 291262.41793.41763.3+50
30 to 34711.3991.91062.0+34
35 to 391683.11552.91773.3+9
40 to 443276.12614.92835.2-44
45 to 494829.03416.43456.4-137
50 to 545089.54027.63756.9-133
55 to 594698.84448.33686.8-101
60 to 643807.14087.73466.4-34
65 to 692344.43526.63396.3+104
70 to 742504.73005.73246.0+74
75 to 791432.72033.82915.4+148
80 to 84591.11743.32123.9+154
85 and over911.71122.11643.0+73
Total persons5,346100.05,315100.05,395100.0+49
Source: Population and household forecasts, 2021 to 2041, prepared by .id (informed decisions), August 2023.

Key findings

In 2021, the dominant age structure for persons in Balgowlah Heights - Clontarf was ages 10 to 14, which accounted for 11.1% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 65 to 69, which is expected to increase by 117 and account for 6.6% of the total persons.

The largest 5 year age group in 2031 is 15 to 19 years, with a total of 463 persons.

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