Northern Beaches CouncilPopulation forecast
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Terrey Hills - Duffys Forest

Population and age structure

Between 2016 and 2026, the age structure forecasts for Terrey Hills - Duffys Forest indicate a 1.1% decrease in population under working age, a 38.6% increase in population of retirement age, and a 1.3% 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 area 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
Terrey Hills - Duffys Forest - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 42055.62396.22566.2+52
5 to 92597.12466.42726.6+13
10 to 142857.82566.63037.4+18
15 to 192827.72626.72786.8-4
20 to 241865.12175.62105.1+25
25 to 291383.81503.91493.6+11
30 to 341524.11433.71583.8+6
35 to 391865.12175.62355.7+49
40 to 442637.22696.92836.9+20
45 to 493158.62526.52726.6-43
50 to 542918.02346.02395.8-51
55 to 592587.02516.52195.3-39
60 to 641815.02285.91964.8+15
65 to 691935.32235.82255.5+32
70 to 741885.11995.12395.8+51
75 to 791193.31684.31964.8+77
80 to 84561.51383.61553.8+99
85 and over1022.81844.72285.5+126
Total persons3,658100.03,875100.04,115100.0+457

Population and household forecasts, 2016 to 2036, prepared by .id , the population experts, November 2017.

Forecast age structure - 5 year age groups
Forecast age structure - 5 year age groups Forecast persons aged 85+,  2036: 228 Forecast persons aged 80-84,  2036: 155 Forecast persons aged 75-79,  2036: 196 Forecast persons aged 70-74,  2036: 239 Forecast persons aged 65-69,  2036: 225 Forecast persons aged 60-64,  2036: 196 Forecast persons aged 55-59,  2036: 219 Forecast persons aged 50-54,  2036: 239 Forecast persons aged 45-49,  2036: 272 Forecast persons aged 40-44,  2036: 283 Forecast persons aged 35-39,  2036: 235 Forecast persons aged 30-34,  2036: 158 Forecast persons aged 25-29,  2036: 149 Forecast persons aged 20-24,  2036: 210 Forecast persons aged 15-19,  2036: 278 Forecast persons aged 10-14,  2036: 303 Forecast persons aged 5-9,  2036: 272 Forecast persons aged 0-4,  2036: 256 Forecast persons aged 85+,  2026: 184 Forecast persons aged 80-84,  2026: 138 Forecast persons aged 75-79,  2026: 168 Forecast persons aged 70-74,  2026: 199 Forecast persons aged 65-69,  2026: 223 Forecast persons aged 60-64,  2026: 228 Forecast persons aged 55-59,  2026: 251 Forecast persons aged 50-54,  2026: 234 Forecast persons aged 45-49,  2026: 252 Forecast persons aged 40-44,  2026: 269 Forecast persons aged 35-39,  2026: 217 Forecast persons aged 30-34,  2026: 143 Forecast persons aged 25-29,  2026: 150 Forecast persons aged 20-24,  2026: 217 Forecast persons aged 15-19,  2026: 262 Forecast persons aged 10-14,  2026: 256 Forecast persons aged 5-9,  2026: 246 Forecast persons aged 0-4,  2026: 239 Forecast persons aged 85+,  2016: 102 Forecast persons aged 80-84,  2016: 56 Forecast persons aged 75-79,  2016: 119 Forecast persons aged 70-74,  2016: 188 Forecast persons aged 65-69,  2016: 193 Forecast persons aged 60-64,  2016: 181 Forecast persons aged 55-59,  2016: 258 Forecast persons aged 50-54,  2016: 291 Forecast persons aged 45-49,  2016: 315 Forecast persons aged 40-44,  2016: 263 Forecast persons aged 35-39,  2016: 186 Forecast persons aged 30-34,  2016: 152 Forecast persons aged 25-29,  2016: 138 Forecast persons aged 20-24,  2016: 186 Forecast persons aged 15-19,  2016: 282 Forecast persons aged 10-14,  2016: 285 Forecast persons aged 5-9,  2016: 259 Forecast persons aged 0-4,  2016: 205
Population and household forecasts, 2016 to 2036, prepared by .id the population experts, November 2017.
Forecast change in age structure - 5 year age groups
Forecast change in age structure - 5 year age groups Forecast persons aged 85+,  2026 to 2036: 44 Forecast persons aged 80-84,  2026 to 2036: 16 Forecast persons aged 75-79,  2026 to 2036: 28 Forecast persons aged 70-74,  2026 to 2036: 40 Forecast persons aged 65-69,  2026 to 2036: 2 Forecast persons aged 60-64,  2026 to 2036: -32 Forecast persons aged 55-59,  2026 to 2036: -32 Forecast persons aged 50-54,  2026 to 2036: 5 Forecast persons aged 45-49,  2026 to 2036: 21 Forecast persons aged 40-44,  2026 to 2036: 14 Forecast persons aged 35-39,  2026 to 2036: 18 Forecast persons aged 30-34,  2026 to 2036: 15 Forecast persons aged 25-29,  2026 to 2036: -1 Forecast persons aged 20-24,  2026 to 2036: -6 Forecast persons aged 15-19,  2026 to 2036: 17 Forecast persons aged 10-14,  2026 to 2036: 47 Forecast persons aged 5-9,  2026 to 2036: 26 Forecast persons aged 0-4,  2026 to 2036: 17 Forecast persons aged 85+,  2016 to 2026: 82 Forecast persons aged 80-84,  2016 to 2026: 82 Forecast persons aged 75-79,  2016 to 2026: 49 Forecast persons aged 70-74,  2016 to 2026: 11 Forecast persons aged 65-69,  2016 to 2026: 30 Forecast persons aged 60-64,  2016 to 2026: 47 Forecast persons aged 55-59,  2016 to 2026: -7 Forecast persons aged 50-54,  2016 to 2026: -57 Forecast persons aged 45-49,  2016 to 2026: -64 Forecast persons aged 40-44,  2016 to 2026: 6 Forecast persons aged 35-39,  2016 to 2026: 31 Forecast persons aged 30-34,  2016 to 2026: -9 Forecast persons aged 25-29,  2016 to 2026: 12 Forecast persons aged 20-24,  2016 to 2026: 31 Forecast persons aged 15-19,  2016 to 2026: -20 Forecast persons aged 10-14,  2016 to 2026: -29 Forecast persons aged 5-9,  2016 to 2026: -13 Forecast persons aged 0-4,  2016 to 2026: 35
Population and household forecasts, 2016 to 2036, prepared by .id the population experts, November 2017.

Key findings

In 2016, the dominant age structure for persons in Terrey Hills - Duffys Forest was ages 45 to 49, which accounted for 8.6% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 80 to 84, which is expected to increase by 82 and account for 3.6% of the total persons.

The largest 5 year age group in 2026 is 40 to 44 years, with a total of 269 persons.

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