Population
Five year age groups
About this topic
Five year age groups show the population in standard five-year cohorts from early childhood through older age. Because each band covers the same span of years, the topic gives a clear and comparable view of an area's age structure.
This topic is useful for identifying growth or decline in specific cohorts and for comparing age patterns across places and over time. For service planning, it is often read together with service age groups, household types, and dwelling types.
Interpretation notes
- Age is reported as at Census night, so the counts are a snapshot of the resident age structure at that point in time.
- Because each band covers the same five-year span, this topic is best for exact cohort comparison rather than service-planning life stages.
Related topics
Key insight
In 2021, 15 to 19 year olds was the largest age group among residents in Tiwi Islands (R), accounting for 9.8% (231 people). This share was higher than Regional NT (7.2%). Since 2016, the biggest change was in 5 to 9 year olds, which decreased by 56 people and 1.9 percentage points.
Section overview
Age structure - Five year age groups
Tiwi Islands (R) - Total persons (Usual residence)
This table summarises five year age groups for Tiwi Islands (R) in 2021 for persons, with comparison against Regional NT and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Tiwi Islands (R), with comparison markers for Regional NT.
0 to 4
2021 count
148
% of total
6.3%
Change from 2016
-0.2pp
148
6.3%
-0.2pp
5 to 9
2021 count
175
% of total
7.5%
Change from 2016
-1.9pp
175
7.5%
-1.9pp
10 to 14
2021 count
220
% of total
9.4%
Change from 2016
-0.1pp
220
9.4%
-0.1pp
15 to 19
2021 count
231
% of total
9.8%
Change from 2016
+1.9pp
231
9.8%
+1.9pp
20 to 24
2021 count
171
% of total
7.3%
Change from 2016
-0.6pp
171
7.3%
-0.6pp
25 to 29
2021 count
230
% of total
9.8%
Change from 2016
+1.5pp
230
9.8%
+1.5pp
30 to 34
2021 count
164
% of total
7.0%
Change from 2016
-2.0pp
164
7.0%
-2.0pp
35 to 39
2021 count
183
% of total
7.8%
Change from 2016
-1.1pp
183
7.8%
-1.1pp
40 to 44
2021 count
166
% of total
7.1%
Change from 2016
+0.6pp
166
7.1%
+0.6pp
45 to 49
2021 count
167
% of total
7.1%
Change from 2016
0.0pp
167
7.1%
0.0pp
50 to 54
2021 count
172
% of total
7.3%
Change from 2016
+1.1pp
172
7.3%
+1.1pp
55 to 59
2021 count
125
% of total
5.3%
Change from 2016
+0.2pp
125
5.3%
+0.2pp
60 to 64
2021 count
111
% of total
4.7%
Change from 2016
+1.0pp
111
4.7%
+1.0pp
65 to 69
2021 count
63
% of total
2.7%
Change from 2016
+0.3pp
63
2.7%
+0.3pp
70 to 74
2021 count
27
% of total
1.1%
Change from 2016
+0.5pp
27
1.1%
+0.5pp
75 to 79
2021 count
9
% of total
0.4%
Change from 2016
+0.2pp
9
0.4%
+0.2pp
80 to 84
2021 count
7
% of total
0.3%
Change from 2016
-0.3pp
7
0.3%
-0.3pp
85 and over
2021 count
0
% of total
0.0%
Change from 2016
-0.1pp
0
0.0%
-0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-12
-0.2pp
5 to 9
-56
-1.9pp
10 to 14
-12
-0.1pp
15 to 19
+38
+1.9pp
20 to 24
-23
-0.6pp
25 to 29
+26
+1.5pp
30 to 34
-56
-2.0pp
35 to 39
-36
-1.1pp
40 to 44
+6
+0.6pp
45 to 49
-7
0.0pp
50 to 54
+19
+1.1pp
55 to 59
+1
+0.2pp
60 to 64
+20
+1.0pp
65 to 69
+3
+0.3pp
70 to 74
+13
+0.5pp
75 to 79
+3
+0.2pp
80 to 84
-8
-0.3pp
85 and over
-3
-0.1pp
Data table
Five year age groups for Tiwi Islands (R). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Regional NT.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Regional NT% | Count | % | Regional NT% | Count | pp | |
| 0 to 4 | 148 | 6.3% | 7.3% | 160 | 6.5% | 8.3% | -12 | -0.2pp |
| 5 to 9 | 175 | 7.5% | 7.8% | 231 | 9.4% | 8.4% | -56 | -1.9pp |
| 10 to 14 | 220 | 9.4% | 7.5% | 232 | 9.5% | 7.7% | -12 | -0.1pp |
| 15 to 19 | 231 | 9.8% | 7.2% | 193 | 7.9% | 7.2% | +38 | +1.9pp |
| 20 to 24 | 171 | 7.3% | 7.4% | 194 | 7.9% | 7.7% | -23 | -0.6pp |
| 25 to 29 | 230 | 9.8% | 9.0% | 204 | 8.3% | 8.9% | +26 | +1.5pp |
| 30 to 34 | 164 | 7.0% | 9.2% | 220 | 9.0% | 8.6% | -56 | -2.0pp |
| 35 to 39 | 183 | 7.8% | 8.1% | 219 | 8.9% | 7.1% | -36 | -1.1pp |
| 40 to 44 | 166 | 7.1% | 6.6% | 160 | 6.5% | 6.8% | +6 | +0.6pp |
| 45 to 49 | 167 | 7.1% | 6.1% | 174 | 7.1% | 6.9% | -7 | 0.0pp |
| 50 to 54 | 172 | 7.3% | 6.2% | 153 | 6.2% | 6.4% | +19 | +1.1pp |
| 55 to 59 | 125 | 5.3% | 5.4% | 124 | 5.1% | 5.5% | +1 | +0.2pp |
| 60 to 64 | 111 | 4.7% | 4.7% | 91 | 3.7% | 4.4% | +20 | +1.0pp |
| 65 to 69 | 63 | 2.7% | 3.3% | 60 | 2.4% | 2.8% | +3 | +0.3pp |
| 70 to 74 | 27 | 1.1% | 2.1% | 14 | 0.6% | 1.6% | +13 | +0.5pp |
| 75 to 79 | 9 | 0.4% | 1.1% | 6 | 0.2% | 0.9% | +3 | +0.2pp |
| 80 to 84 | 7 | 0.3% | 0.6% | 15 | 0.6% | 0.5% | -8 | -0.3pp |
| 85 and over | 0 | 0.0% | 0.4% | 3 | 0.1% | 0.3% | -3 | -0.1pp |
| Total | 2,348 | 100.0% | 100.0% | 2,453 | 100.0% | 100.0% | -105 | 0.0pp |