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City of SydneyPopulation forecast

City of Sydney

Population and age structure

Between 2021 and 2031, the age structure forecasts for City of Sydney indicate a 31.2% increase in population under working age, a 22.8% increase in population of retirement age, and a 31.5% 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 Sydney 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
City of Sydney - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 47,5013.510,5893.811,4063.7+3,905
5 to 94,8312.26,0362.26,7572.2+1,926
10 to 143,8961.84,6691.75,6241.8+1,728
15 to 195,6562.611,7244.212,8304.1+7,174
20 to 2422,51310.531,58211.333,70210.9+11,189
25 to 2935,51616.543,47015.546,36215.0+10,846
30 to 3434,20615.941,29914.744,13814.2+9,932
35 to 3923,83011.132,06611.434,43911.1+10,609
40 to 4415,7877.323,9228.526,0848.4+10,297
45 to 4912,0465.617,4256.220,0746.5+8,028
50 to 5410,7695.013,0824.716,1785.2+5,409
55 to 599,6264.510,6983.813,1244.2+3,498
60 to 648,3193.99,0673.210,2873.3+1,968
65 to 696,6853.17,4262.68,0862.6+1,401
70 to 745,7112.76,1532.26,8062.2+1,095
75 to 793,5961.74,7031.75,5181.8+1,922
80 to 842,3651.13,6951.34,4051.4+2,040
85 and over1,9930.93,0171.13,9641.3+1,971
Total persons214,846100.0280,624100.0309,785100.0+94,939
Source: Population and household forecasts, 2021 to 2041, prepared by .id (informed decisions), November 2022.

Key findings

In 2021, the dominant age structure for persons in City of Sydney was ages 25 to 29, which accounted for 16.5% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 20 to 24, which is expected to increase by 9,069 and account for 11.3% of the total persons.

The largest 5 year age group in 2031 is 25 to 29 years, with a total of 43,470 persons.

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