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, 30 to 34 year olds was the largest age group among residents in Katherine (T), accounting for 10% (969 people). This share was higher than Regional NT (9.2%). Since 2016, the biggest change was in 45 to 49 year olds, which decreased by 180 people and 1.8 percentage points.
Section overview
Age structure - Five year age groups
Katherine (T) - Total persons (Usual residence)
This table summarises five year age groups for Katherine (T) 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 Katherine (T), with comparison markers for Regional NT.
0 to 4
2021 count
700
% of total
7.3%
Change from 2016
-0.9pp
700
7.3%
-0.9pp
5 to 9
2021 count
758
% of total
7.9%
Change from 2016
+0.4pp
758
7.9%
+0.4pp
10 to 14
2021 count
702
% of total
7.3%
Change from 2016
+0.2pp
702
7.3%
+0.2pp
15 to 19
2021 count
504
% of total
5.2%
Change from 2016
-0.7pp
504
5.2%
-0.7pp
20 to 24
2021 count
665
% of total
6.9%
Change from 2016
+0.3pp
665
6.9%
+0.3pp
25 to 29
2021 count
887
% of total
9.2%
Change from 2016
-0.1pp
887
9.2%
-0.1pp
30 to 34
2021 count
969
% of total
10.0%
Change from 2016
+1.1pp
969
10.0%
+1.1pp
35 to 39
2021 count
801
% of total
8.3%
Change from 2016
+1.4pp
801
8.3%
+1.4pp
40 to 44
2021 count
595
% of total
6.2%
Change from 2016
+0.1pp
595
6.2%
+0.1pp
45 to 49
2021 count
553
% of total
5.7%
Change from 2016
-1.8pp
553
5.7%
-1.8pp
50 to 54
2021 count
622
% of total
6.5%
Change from 2016
-0.4pp
622
6.5%
-0.4pp
55 to 59
2021 count
531
% of total
5.5%
Change from 2016
-0.2pp
531
5.5%
-0.2pp
60 to 64
2021 count
495
% of total
5.1%
Change from 2016
0.0pp
495
5.1%
0.0pp
65 to 69
2021 count
353
% of total
3.7%
Change from 2016
+0.2pp
353
3.7%
+0.2pp
70 to 74
2021 count
237
% of total
2.5%
Change from 2016
+0.1pp
237
2.5%
+0.1pp
75 to 79
2021 count
147
% of total
1.5%
Change from 2016
-0.1pp
147
1.5%
-0.1pp
80 to 84
2021 count
76
% of total
0.8%
Change from 2016
+0.3pp
76
0.8%
+0.3pp
85 and over
2021 count
44
% of total
0.5%
Change from 2016
0.0pp
44
0.5%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-93
-0.9pp
5 to 9
+32
+0.4pp
10 to 14
+15
+0.2pp
15 to 19
-71
-0.7pp
20 to 24
+23
+0.3pp
25 to 29
-21
-0.1pp
30 to 34
+108
+1.1pp
35 to 39
+134
+1.4pp
40 to 44
+4
+0.1pp
45 to 49
-180
-1.8pp
50 to 54
-46
-0.4pp
55 to 59
-26
-0.2pp
60 to 64
-4
0.0pp
65 to 69
+13
+0.2pp
70 to 74
+1
+0.1pp
75 to 79
-10
-0.1pp
80 to 84
+23
+0.3pp
85 and over
-1
0.0pp
Data table
Five year age groups for Katherine (T). 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 | 700 | 7.3% | 7.3% | 793 | 8.2% | 8.3% | -93 | -0.9pp |
| 5 to 9 | 758 | 7.9% | 7.8% | 726 | 7.5% | 8.4% | +32 | +0.4pp |
| 10 to 14 | 702 | 7.3% | 7.5% | 687 | 7.1% | 7.7% | +15 | +0.2pp |
| 15 to 19 | 504 | 5.2% | 7.2% | 575 | 5.9% | 7.2% | -71 | -0.7pp |
| 20 to 24 | 665 | 6.9% | 7.4% | 642 | 6.6% | 7.7% | +23 | +0.3pp |
| 25 to 29 | 887 | 9.2% | 9.0% | 908 | 9.3% | 8.9% | -21 | -0.1pp |
| 30 to 34 | 969 | 10.0% | 9.2% | 861 | 8.9% | 8.6% | +108 | +1.1pp |
| 35 to 39 | 801 | 8.3% | 8.1% | 667 | 6.9% | 7.1% | +134 | +1.4pp |
| 40 to 44 | 595 | 6.2% | 6.6% | 591 | 6.1% | 6.8% | +4 | +0.1pp |
| 45 to 49 | 553 | 5.7% | 6.1% | 733 | 7.5% | 6.9% | -180 | -1.8pp |
| 50 to 54 | 622 | 6.5% | 6.2% | 668 | 6.9% | 6.4% | -46 | -0.4pp |
| 55 to 59 | 531 | 5.5% | 5.4% | 557 | 5.7% | 5.5% | -26 | -0.2pp |
| 60 to 64 | 495 | 5.1% | 4.7% | 499 | 5.1% | 4.4% | -4 | 0.0pp |
| 65 to 69 | 353 | 3.7% | 3.3% | 340 | 3.5% | 2.8% | +13 | +0.2pp |
| 70 to 74 | 237 | 2.5% | 2.1% | 236 | 2.4% | 1.6% | +1 | +0.1pp |
| 75 to 79 | 147 | 1.5% | 1.1% | 157 | 1.6% | 0.9% | -10 | -0.1pp |
| 80 to 84 | 76 | 0.8% | 0.6% | 53 | 0.5% | 0.5% | +23 | +0.3pp |
| 85 and over | 44 | 0.5% | 0.4% | 45 | 0.5% | 0.3% | -1 | 0.0pp |
| Total | 9,643 | 100.0% | 100.0% | 9,717 | 100.0% | 100.0% | -74 | 0.0pp |