City of OnkaparingaPopulation forecast
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Seaford

Population and age structure

Between 2016 and 2026, the age structure forecasts for Seaford indicate a 20.3% increase in population under working age, a 17.4% increase in population of retirement age, and a 11.3% 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 Onkaparinga 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
Seaford - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 42776.13296.33526.1+75
5 to 92585.73456.63686.4+110
10 to 142816.23085.93436.0+62
15 to 192044.52474.72995.2+95
20 to 242746.02444.72594.5-14
25 to 292555.62975.73075.3+52
30 to 343788.33637.03676.4-11
35 to 392515.53506.73776.6+126
40 to 442776.13657.03796.6+102
45 to 492435.32975.73636.3+119
50 to 542365.22945.63546.2+118
55 to 592715.92655.13085.4+37
60 to 642836.22514.82985.2+15
65 to 692585.72705.22764.8+18
70 to 742264.92865.52774.8+52
75 to 791854.12504.82724.7+86
80 to 841824.02094.02544.4+72
85 and over2244.92474.72975.2+73
Total persons4,563100.05,216100.05,750100.0+1,187

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

Forecast age structure - 5 year age groups
Forecast age structure - 5 year age groups Forecast persons aged 85+,  2036: 297 Forecast persons aged 80-84,  2036: 254 Forecast persons aged 75-79,  2036: 272 Forecast persons aged 70-74,  2036: 277 Forecast persons aged 65-69,  2036: 276 Forecast persons aged 60-64,  2036: 298 Forecast persons aged 55-59,  2036: 308 Forecast persons aged 50-54,  2036: 354 Forecast persons aged 45-49,  2036: 363 Forecast persons aged 40-44,  2036: 379 Forecast persons aged 35-39,  2036: 377 Forecast persons aged 30-34,  2036: 367 Forecast persons aged 25-29,  2036: 307 Forecast persons aged 20-24,  2036: 259 Forecast persons aged 15-19,  2036: 299 Forecast persons aged 10-14,  2036: 343 Forecast persons aged 5-9,  2036: 368 Forecast persons aged 0-4,  2036: 352 Forecast persons aged 85+,  2026: 247 Forecast persons aged 80-84,  2026: 209 Forecast persons aged 75-79,  2026: 250 Forecast persons aged 70-74,  2026: 286 Forecast persons aged 65-69,  2026: 270 Forecast persons aged 60-64,  2026: 251 Forecast persons aged 55-59,  2026: 265 Forecast persons aged 50-54,  2026: 294 Forecast persons aged 45-49,  2026: 297 Forecast persons aged 40-44,  2026: 365 Forecast persons aged 35-39,  2026: 350 Forecast persons aged 30-34,  2026: 363 Forecast persons aged 25-29,  2026: 297 Forecast persons aged 20-24,  2026: 244 Forecast persons aged 15-19,  2026: 247 Forecast persons aged 10-14,  2026: 308 Forecast persons aged 5-9,  2026: 345 Forecast persons aged 0-4,  2026: 329 Forecast persons aged 85+,  2016: 224 Forecast persons aged 80-84,  2016: 182 Forecast persons aged 75-79,  2016: 185 Forecast persons aged 70-74,  2016: 226 Forecast persons aged 65-69,  2016: 258 Forecast persons aged 60-64,  2016: 283 Forecast persons aged 55-59,  2016: 271 Forecast persons aged 50-54,  2016: 236 Forecast persons aged 45-49,  2016: 243 Forecast persons aged 40-44,  2016: 277 Forecast persons aged 35-39,  2016: 251 Forecast persons aged 30-34,  2016: 378 Forecast persons aged 25-29,  2016: 255 Forecast persons aged 20-24,  2016: 274 Forecast persons aged 15-19,  2016: 204 Forecast persons aged 10-14,  2016: 281 Forecast persons aged 5-9,  2016: 258 Forecast persons aged 0-4,  2016: 277
Population and household forecasts, 2016 to 2036, prepared by .id the population experts, October 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: 49 Forecast persons aged 80-84,  2026 to 2036: 44 Forecast persons aged 75-79,  2026 to 2036: 22 Forecast persons aged 70-74,  2026 to 2036: -8 Forecast persons aged 65-69,  2026 to 2036: 6 Forecast persons aged 60-64,  2026 to 2036: 47 Forecast persons aged 55-59,  2026 to 2036: 43 Forecast persons aged 50-54,  2026 to 2036: 60 Forecast persons aged 45-49,  2026 to 2036: 66 Forecast persons aged 40-44,  2026 to 2036: 14 Forecast persons aged 35-39,  2026 to 2036: 27 Forecast persons aged 30-34,  2026 to 2036: 5 Forecast persons aged 25-29,  2026 to 2036: 10 Forecast persons aged 20-24,  2026 to 2036: 16 Forecast persons aged 15-19,  2026 to 2036: 52 Forecast persons aged 10-14,  2026 to 2036: 35 Forecast persons aged 5-9,  2026 to 2036: 23 Forecast persons aged 0-4,  2026 to 2036: 24 Forecast persons aged 85+,  2016 to 2026: 23 Forecast persons aged 80-84,  2016 to 2026: 28 Forecast persons aged 75-79,  2016 to 2026: 65 Forecast persons aged 70-74,  2016 to 2026: 60 Forecast persons aged 65-69,  2016 to 2026: 12 Forecast persons aged 60-64,  2016 to 2026: -32 Forecast persons aged 55-59,  2016 to 2026: -6 Forecast persons aged 50-54,  2016 to 2026: 58 Forecast persons aged 45-49,  2016 to 2026: 54 Forecast persons aged 40-44,  2016 to 2026: 88 Forecast persons aged 35-39,  2016 to 2026: 99 Forecast persons aged 30-34,  2016 to 2026: -15 Forecast persons aged 25-29,  2016 to 2026: 42 Forecast persons aged 20-24,  2016 to 2026: -30 Forecast persons aged 15-19,  2016 to 2026: 43 Forecast persons aged 10-14,  2016 to 2026: 27 Forecast persons aged 5-9,  2016 to 2026: 87 Forecast persons aged 0-4,  2016 to 2026: 51
Population and household forecasts, 2016 to 2036, prepared by .id the population experts, October 2017.

Key findings

In 2016, the dominant age structure for persons in Seaford was ages 30 to 34, which accounted for 8.3% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 35 to 39, which is expected to increase by 99 and account for 6.7% of the total persons.

The largest 5 year age group in 2026 is 40 to 44 years, with a total of 365 persons.

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