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, 35 to 39 year olds was the largest age group among residents in Knoxfield, accounting for 7.5% (576 people). This share was higher than Knox (C) (7.2%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 576 people and 7.5 percentage points.
Section overview
Age structure - Five year age groups
Knoxfield - Total persons (Usual residence)
This table summarises five year age groups for Knoxfield in 2021 for persons, with comparison against Knox (C) and change since 2016.
Chart view
Age structure - Five year age groups snapshot
2021 distribution by category for Knoxfield, with comparison markers for Knox (C).
0 to 4
2021 count
392
% of total
5.1%
Change from 2016
+5.1pp
392
5.1%
+5.1pp
5 to 9
2021 count
459
% of total
6.0%
Change from 2016
+6.0pp
459
6.0%
+6.0pp
10 to 14
2021 count
422
% of total
5.5%
Change from 2016
+5.5pp
422
5.5%
+5.5pp
15 to 19
2021 count
460
% of total
6.0%
Change from 2016
+6.0pp
460
6.0%
+6.0pp
20 to 24
2021 count
461
% of total
6.0%
Change from 2016
-1.7pp
461
6.0%
-1.7pp
25 to 29
2021 count
449
% of total
5.9%
Change from 2016
+5.9pp
449
5.9%
+5.9pp
30 to 34
2021 count
472
% of total
6.2%
Change from 2016
+6.2pp
472
6.2%
+6.2pp
35 to 39
2021 count
576
% of total
7.5%
Change from 2016
+7.5pp
576
7.5%
+7.5pp
40 to 44
2021 count
540
% of total
7.1%
Change from 2016
-0.6pp
540
7.1%
-0.6pp
45 to 49
2021 count
475
% of total
6.2%
Change from 2016
+6.2pp
475
6.2%
+6.2pp
50 to 54
2021 count
510
% of total
6.7%
Change from 2016
+6.7pp
510
6.7%
+6.7pp
55 to 59
2021 count
478
% of total
6.3%
Change from 2016
+6.3pp
478
6.3%
+6.3pp
60 to 64
2021 count
430
% of total
5.6%
Change from 2016
-2.1pp
430
5.6%
-2.1pp
65 to 69
2021 count
399
% of total
5.2%
Change from 2016
+5.2pp
399
5.2%
+5.2pp
70 to 74
2021 count
401
% of total
5.2%
Change from 2016
+5.2pp
401
5.2%
+5.2pp
75 to 79
2021 count
342
% of total
4.5%
Change from 2016
+4.5pp
342
4.5%
+4.5pp
80 to 84
2021 count
223
% of total
2.9%
Change from 2016
+2.9pp
223
2.9%
+2.9pp
85 and over
2021 count
130
% of total
1.7%
Change from 2016
+1.7pp
130
1.7%
+1.7pp
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+392
+5.1pp
5 to 9
+459
+6.0pp
10 to 14
+422
+5.5pp
15 to 19
+460
+6.0pp
20 to 24
+458
-1.7pp
25 to 29
+449
+5.9pp
30 to 34
+472
+6.2pp
35 to 39
+576
+7.5pp
40 to 44
+537
-0.6pp
45 to 49
+475
+6.2pp
50 to 54
+510
+6.7pp
55 to 59
+478
+6.3pp
60 to 64
+427
-2.1pp
65 to 69
+399
+5.2pp
70 to 74
+401
+5.2pp
75 to 79
+342
+4.5pp
80 to 84
+223
+2.9pp
85 and over
+130
+1.7pp
Data table
Five year age groups for Knoxfield. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Knox (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Knox (C)% | Count | % | Knox (C)% | Count | pp | |
| 0 to 4 | 392 | 5.1% | 5.3% | 0 | 0.0% | 5.9% | +392 | +5.1pp |
| 5 to 9 | 459 | 6.0% | 5.9% | 0 | 0.0% | 5.9% | +459 | +6.0pp |
| 10 to 14 | 422 | 5.5% | 5.8% | 0 | 0.0% | 5.8% | +422 | +5.5pp |
| 15 to 19 | 460 | 6.0% | 5.9% | 0 | 0.0% | 6.4% | +460 | +6.0pp |
| 20 to 24 | 461 | 6.0% | 6.1% | 3 | 7.7% | 6.6% | +458 | -1.7pp |
| 25 to 29 | 449 | 5.9% | 6.0% | 0 | 0.0% | 6.4% | +449 | +5.9pp |
| 30 to 34 | 472 | 6.2% | 6.7% | 0 | 0.0% | 6.8% | +472 | +6.2pp |
| 35 to 39 | 576 | 7.5% | 7.2% | 0 | 0.0% | 6.7% | +576 | +7.5pp |
| 40 to 44 | 540 | 7.1% | 6.8% | 3 | 7.7% | 6.8% | +537 | -0.6pp |
| 45 to 49 | 475 | 6.2% | 6.7% | 0 | 0.0% | 7.2% | +475 | +6.2pp |
| 50 to 54 | 510 | 6.7% | 6.8% | 0 | 0.0% | 7.2% | +510 | +6.7pp |
| 55 to 59 | 478 | 6.3% | 6.7% | 0 | 0.0% | 6.8% | +478 | +6.3pp |
| 60 to 64 | 430 | 5.6% | 6.2% | 3 | 7.7% | 6.1% | +427 | -2.1pp |
| 65 to 69 | 399 | 5.2% | 5.4% | 0 | 0.0% | 5.2% | +399 | +5.2pp |
| 70 to 74 | 401 | 5.2% | 4.6% | 0 | 0.0% | 3.6% | +401 | +5.2pp |
| 75 to 79 | 342 | 4.5% | 3.2% | 0 | 0.0% | 2.7% | +342 | +4.5pp |
| 80 to 84 | 223 | 2.9% | 2.4% | 0 | 0.0% | 1.9% | +223 | +2.9pp |
| 85 and over | 130 | 1.7% | 2.2% | 0 | 0.0% | 2.0% | +130 | +1.7pp |
| Total | 7,645 | 100.0% | 100.0% | 39 | 100.0% | 100.0% | +7,606 | 0.0pp |