svg rectangle color
City of KwinanaPopulation forecast

Mortimer District

Population and age structure

Between 2016 and 2026, the age structure forecasts for Mortimer District indicate a 195.2% increase in population under working age, a 145.1% increase in population of retirement age, and a 58.5% 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 Mortimer District 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
Mortimer District - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 41795.55309.01,43010.1+1,251
5 to 91284.04748.11,2218.7+1,093
10 to 141524.73516.08335.9+681
15 to 191745.43235.57635.4+589
20 to 2441813.04898.31,1938.5+775
25 to 2943913.661210.41,63011.6+1,191
30 to 3437111.568511.71,66611.8+1,295
35 to 392628.15619.51,2899.1+1,027
40 to 442598.04307.39476.7+688
45 to 492206.83305.67605.4+540
50 to 541966.12694.65634.0+367
55 to 591645.12394.14573.2+293
60 to 641023.21903.23512.5+249
65 to 69702.21502.62892.1+219
70 to 74371.1961.62531.8+216
75 to 79351.1701.21881.3+153
80 to 8470.2430.71210.9+114
85 and over130.4380.71421.0+129
Total persons3,226100.05,883100.014,096100.0+10,870
Population and household forecasts, 2016 to 2036, prepared by .id , the population experts, March 2018.

Key findings

In 2016, the dominant age structure for persons in Mortimer District was ages 25 to 29, which accounted for 13.6% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 0 to 4, which is expected to increase by 351 and account for 9.0% of the total persons.

The largest 5 year age group in 2026 is 30 to 34 years, with a total of 685 persons.

DISCLAIMER: While all due care has been taken to ensure that the content of this website is accurate and current, there may be errors or omissions in it and no legal responsibility is accepted for the information and opinions in this website.

Please view our Privacy Policy, Terms of use and Legal notices. Stats NZ Data and the copyright in the Stats NZ Data remains the property of the Statistics New Zealand.

The copyright in the way .id has modified, transformed or reconfigured the Stats NZ Data as published on this website remains the property of .id. Stats NZ Data can be accessed on the Statistics New Zealand website at Unless otherwise specified, content that Stats NZ produce is licensed under the Creative Commons Attribution 4.0 International licence. For further information see