Porirua CityPopulation forecast
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Titahi Bay

Population and age structure

Between 2013 and 2028, the age structure forecasts for Titahi Bay indicate a 6.3% decrease in population under working age, a 45.7% increase in population of retirement age, and a 0.1% 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 Porirua City 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
Titahi Bay - Total persons201320282043Change between 2013 and 2043
Age group (years)Number%Number%Number%Number
0 to 44249.63577.83687.8-56
5 to 93798.63467.63517.4-29
10 to 142856.43166.93166.7+31
15 to 192555.83247.13056.5+50
20 to 243026.82806.22906.2-12
25 to 292786.32465.42725.8-6
30 to 343016.82766.12936.2-8
35 to 393347.63297.23287.0-7
40 to 443578.13237.13256.9-32
45 to 492666.03016.63026.4+36
50 to 542856.42976.52956.3+10
55 to 592766.22886.32816.0+5
60 to 642375.42254.92485.3+12
65 to 691774.02054.52204.7+42
70 to 741152.61743.81934.1+78
75 to 79691.61383.01523.2+83
80 to 84451.0831.81082.3+63
85 and over340.8410.9611.3+27
Total persons4,421100.04,552100.04,708100.0+287

Population and household forecasts, 2013 to 2043, prepared by .id , the population experts, January 2020.

Forecast age structure - 5 year age groups
Forecast age structure - 5 year age groups Forecast persons aged 85+,  2043: 61 Forecast persons aged 80-84,  2043: 108 Forecast persons aged 75-79,  2043: 152 Forecast persons aged 70-74,  2043: 193 Forecast persons aged 65-69,  2043: 220 Forecast persons aged 60-64,  2043: 248 Forecast persons aged 55-59,  2043: 281 Forecast persons aged 50-54,  2043: 295 Forecast persons aged 45-49,  2043: 302 Forecast persons aged 40-44,  2043: 325 Forecast persons aged 35-39,  2043: 328 Forecast persons aged 30-34,  2043: 293 Forecast persons aged 25-29,  2043: 272 Forecast persons aged 20-24,  2043: 290 Forecast persons aged 15-19,  2043: 305 Forecast persons aged 10-14,  2043: 316 Forecast persons aged 5-9,  2043: 351 Forecast persons aged 0-4,  2043: 368 Forecast persons aged 85+,  2028: 41 Forecast persons aged 80-84,  2028: 83 Forecast persons aged 75-79,  2028: 138 Forecast persons aged 70-74,  2028: 174 Forecast persons aged 65-69,  2028: 205 Forecast persons aged 60-64,  2028: 225 Forecast persons aged 55-59,  2028: 288 Forecast persons aged 50-54,  2028: 297 Forecast persons aged 45-49,  2028: 301 Forecast persons aged 40-44,  2028: 323 Forecast persons aged 35-39,  2028: 329 Forecast persons aged 30-34,  2028: 276 Forecast persons aged 25-29,  2028: 246 Forecast persons aged 20-24,  2028: 280 Forecast persons aged 15-19,  2028: 324 Forecast persons aged 10-14,  2028: 316 Forecast persons aged 5-9,  2028: 346 Forecast persons aged 0-4,  2028: 357 Forecast persons aged 85+,  2013: 34 Forecast persons aged 80-84,  2013: 45 Forecast persons aged 75-79,  2013: 69 Forecast persons aged 70-74,  2013: 115 Forecast persons aged 65-69,  2013: 177 Forecast persons aged 60-64,  2013: 237 Forecast persons aged 55-59,  2013: 276 Forecast persons aged 50-54,  2013: 285 Forecast persons aged 45-49,  2013: 266 Forecast persons aged 40-44,  2013: 357 Forecast persons aged 35-39,  2013: 334 Forecast persons aged 30-34,  2013: 301 Forecast persons aged 25-29,  2013: 278 Forecast persons aged 20-24,  2013: 302 Forecast persons aged 15-19,  2013: 255 Forecast persons aged 10-14,  2013: 285 Forecast persons aged 5-9,  2013: 379 Forecast persons aged 0-4,  2013: 424
Population and household forecasts, 2013 to 2043, prepared by .id the population experts, January 2020.
Forecast change in age structure - 5 year age groups
Forecast change in age structure - 5 year age groups Forecast persons aged 85+,  2028 to 2043: 20 Forecast persons aged 80-84,  2028 to 2043: 25 Forecast persons aged 75-79,  2028 to 2043: 14 Forecast persons aged 70-74,  2028 to 2043: 19 Forecast persons aged 65-69,  2028 to 2043: 14 Forecast persons aged 60-64,  2028 to 2043: 24 Forecast persons aged 55-59,  2028 to 2043: -7 Forecast persons aged 50-54,  2028 to 2043: -3 Forecast persons aged 45-49,  2028 to 2043: 1 Forecast persons aged 40-44,  2028 to 2043: 2 Forecast persons aged 35-39,  2028 to 2043: -1 Forecast persons aged 30-34,  2028 to 2043: 17 Forecast persons aged 25-29,  2028 to 2043: 26 Forecast persons aged 20-24,  2028 to 2043: 10 Forecast persons aged 15-19,  2028 to 2043: -19 Forecast persons aged 10-14,  2028 to 2043: 0 Forecast persons aged 5-9,  2028 to 2043: 5 Forecast persons aged 0-4,  2028 to 2043: 11 Forecast persons aged 85+,  2013 to 2028: 7 Forecast persons aged 80-84,  2013 to 2028: 38 Forecast persons aged 75-79,  2013 to 2028: 69 Forecast persons aged 70-74,  2013 to 2028: 59 Forecast persons aged 65-69,  2013 to 2028: 28 Forecast persons aged 60-64,  2013 to 2028: -12 Forecast persons aged 55-59,  2013 to 2028: 12 Forecast persons aged 50-54,  2013 to 2028: 13 Forecast persons aged 45-49,  2013 to 2028: 35 Forecast persons aged 40-44,  2013 to 2028: -34 Forecast persons aged 35-39,  2013 to 2028: -5 Forecast persons aged 30-34,  2013 to 2028: -25 Forecast persons aged 25-29,  2013 to 2028: -32 Forecast persons aged 20-24,  2013 to 2028: -21 Forecast persons aged 15-19,  2013 to 2028: 69 Forecast persons aged 10-14,  2013 to 2028: 31 Forecast persons aged 5-9,  2013 to 2028: -33 Forecast persons aged 0-4,  2013 to 2028: -67
Population and household forecasts, 2013 to 2043, prepared by .id the population experts, January 2020.

Key findings

In 2013, the dominant age structure for persons in Titahi Bay was ages 0 to 4, which accounted for 9.6% of the total persons.

The largest increase in persons between 2013 and 2028 is forecast to be in ages 15 to 19, which is expected to increase by 69 and account for 7.1% of the total persons.

The largest 5 year age group in 2028 is 0 to 4 years, with a total of 357 persons.

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