Northern Beaches CouncilPopulation forecast
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Seaforth

Population and age structure

Between 2016 and 2026, the age structure forecasts for Seaforth indicate a 12.7% decrease in population under working age, a 30.7% increase in population of retirement age, and a 1.5% 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
Seaforth - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 45527.35397.25687.4+16
5 to 97319.75887.86298.2-102
10 to 146658.85747.65937.7-72
15 to 195367.15707.65286.8-8
20 to 244496.04285.73985.2-51
25 to 292493.32503.32663.4+17
30 to 341982.63094.13214.2+123
35 to 394766.34866.55166.7+40
40 to 447279.65417.26047.8-123
45 to 496228.25627.55877.6-35
50 to 545937.95877.84976.4-96
55 to 594846.44616.14345.6-50
60 to 643544.74265.74295.6+75
65 to 692984.03344.53244.2+26
70 to 742353.12703.63214.2+86
75 to 791652.22433.22753.6+110
80 to 84721.01732.31992.6+127
85 and over1361.81642.22242.9+88
Total persons7,542100.07,506100.07,713100.0+171

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: 224 Forecast persons aged 80-84,  2036: 199 Forecast persons aged 75-79,  2036: 275 Forecast persons aged 70-74,  2036: 321 Forecast persons aged 65-69,  2036: 324 Forecast persons aged 60-64,  2036: 429 Forecast persons aged 55-59,  2036: 434 Forecast persons aged 50-54,  2036: 497 Forecast persons aged 45-49,  2036: 587 Forecast persons aged 40-44,  2036: 604 Forecast persons aged 35-39,  2036: 516 Forecast persons aged 30-34,  2036: 321 Forecast persons aged 25-29,  2036: 266 Forecast persons aged 20-24,  2036: 398 Forecast persons aged 15-19,  2036: 528 Forecast persons aged 10-14,  2036: 593 Forecast persons aged 5-9,  2036: 629 Forecast persons aged 0-4,  2036: 568 Forecast persons aged 85+,  2026: 164 Forecast persons aged 80-84,  2026: 173 Forecast persons aged 75-79,  2026: 243 Forecast persons aged 70-74,  2026: 270 Forecast persons aged 65-69,  2026: 334 Forecast persons aged 60-64,  2026: 426 Forecast persons aged 55-59,  2026: 461 Forecast persons aged 50-54,  2026: 587 Forecast persons aged 45-49,  2026: 562 Forecast persons aged 40-44,  2026: 541 Forecast persons aged 35-39,  2026: 486 Forecast persons aged 30-34,  2026: 309 Forecast persons aged 25-29,  2026: 250 Forecast persons aged 20-24,  2026: 428 Forecast persons aged 15-19,  2026: 570 Forecast persons aged 10-14,  2026: 574 Forecast persons aged 5-9,  2026: 588 Forecast persons aged 0-4,  2026: 539 Forecast persons aged 85+,  2016: 136 Forecast persons aged 80-84,  2016: 72 Forecast persons aged 75-79,  2016: 165 Forecast persons aged 70-74,  2016: 235 Forecast persons aged 65-69,  2016: 298 Forecast persons aged 60-64,  2016: 354 Forecast persons aged 55-59,  2016: 484 Forecast persons aged 50-54,  2016: 593 Forecast persons aged 45-49,  2016: 622 Forecast persons aged 40-44,  2016: 727 Forecast persons aged 35-39,  2016: 476 Forecast persons aged 30-34,  2016: 198 Forecast persons aged 25-29,  2016: 249 Forecast persons aged 20-24,  2016: 449 Forecast persons aged 15-19,  2016: 536 Forecast persons aged 10-14,  2016: 665 Forecast persons aged 5-9,  2016: 731 Forecast persons aged 0-4,  2016: 552
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: 60 Forecast persons aged 80-84,  2026 to 2036: 27 Forecast persons aged 75-79,  2026 to 2036: 32 Forecast persons aged 70-74,  2026 to 2036: 51 Forecast persons aged 65-69,  2026 to 2036: -10 Forecast persons aged 60-64,  2026 to 2036: 3 Forecast persons aged 55-59,  2026 to 2036: -27 Forecast persons aged 50-54,  2026 to 2036: -90 Forecast persons aged 45-49,  2026 to 2036: 24 Forecast persons aged 40-44,  2026 to 2036: 63 Forecast persons aged 35-39,  2026 to 2036: 31 Forecast persons aged 30-34,  2026 to 2036: 11 Forecast persons aged 25-29,  2026 to 2036: 16 Forecast persons aged 20-24,  2026 to 2036: -30 Forecast persons aged 15-19,  2026 to 2036: -42 Forecast persons aged 10-14,  2026 to 2036: 18 Forecast persons aged 5-9,  2026 to 2036: 41 Forecast persons aged 0-4,  2026 to 2036: 30 Forecast persons aged 85+,  2016 to 2026: 28 Forecast persons aged 80-84,  2016 to 2026: 101 Forecast persons aged 75-79,  2016 to 2026: 78 Forecast persons aged 70-74,  2016 to 2026: 35 Forecast persons aged 65-69,  2016 to 2026: 36 Forecast persons aged 60-64,  2016 to 2026: 72 Forecast persons aged 55-59,  2016 to 2026: -23 Forecast persons aged 50-54,  2016 to 2026: -6 Forecast persons aged 45-49,  2016 to 2026: -60 Forecast persons aged 40-44,  2016 to 2026: -186 Forecast persons aged 35-39,  2016 to 2026: 10 Forecast persons aged 30-34,  2016 to 2026: 111 Forecast persons aged 25-29,  2016 to 2026: 1 Forecast persons aged 20-24,  2016 to 2026: -21 Forecast persons aged 15-19,  2016 to 2026: 34 Forecast persons aged 10-14,  2016 to 2026: -91 Forecast persons aged 5-9,  2016 to 2026: -143 Forecast persons aged 0-4,  2016 to 2026: -13
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 Seaforth was ages 5 to 9, which accounted for 9.7% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 30 to 34, which is expected to increase by 111 and account for 4.1% of the total persons.

The largest 5 year age group in 2026 is 5 to 9 years, with a total of 588 persons.

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