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Willoughby City CouncilPopulation forecast

Willoughby City Council

Population and age structure

Between 2021 and 2026, the age structure forecasts for Willoughby City Council indicate a 4.6% increase in population under working age, a 10.5% increase in population of retirement age, and a 8.6% 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 Willoughby City 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
Willoughby City Council - Total persons202120262036Change between 2021 and 2036
Age group (years)Number%Number%Number%Number
0 to 44,0495.34,7935.84,9025.6+852
5 to 95,2546.94,9376.05,2836.0+29
10 to 145,2166.95,4586.65,3196.1+103
15 to 194,2215.65,1286.25,0045.7+783
20 to 244,0395.34,6705.75,2005.9+1,160
25 to 294,4305.84,9356.05,3576.1+927
30 to 345,0206.65,4286.65,6156.4+596
35 to 396,4548.56,4197.86,5397.5+85
40 to 446,3628.46,9048.46,8157.8+454
45 to 495,8517.76,2107.56,4657.4+614
50 to 544,9356.55,3776.55,9116.8+976
55 to 594,4565.94,5965.65,1435.9+687
60 to 643,7504.94,1325.04,4935.1+743
65 to 693,4184.53,5374.33,9064.5+488
70 to 743,0804.03,1903.93,5444.1+464
75 to 792,0282.72,7793.42,9803.4+951
80 to 841,5252.01,7332.12,3892.7+863
85 and over1,9672.62,0372.52,5532.9+586
Total persons76,056100.082,263100.087,415100.0+11,359
Source: Population and household forecasts, 2021 to 2036, prepared by .id (informed decisions), January 2023.

Key findings

In 2021, the dominant age structure for persons in Willoughby City Council was ages 35 to 39, which accounted for 8.5% of the total persons.

The largest increase in persons between 2021 and 2026 is forecast to be in ages 15 to 19, which is expected to increase by 906 and account for 6.2% of the total persons.

The largest 5 year age group in 2026 is 40 to 44 years, with a total of 6,904 persons.

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