Age Structure (Irish 1821 classification)
| Age Groups used in 1821 Irish Census | 1821 |
|---|---|
| 0 to 4 |
5,853
|
| 5 to 9 |
5,098
|
| 10 to 14 |
4,584
|
| 15 to 19 |
4,451
|
| 20 to 29 |
6,319
|
| 30 to 39 |
3,972
|
| 40 to 49 |
3,020
|
| 50 to 59 |
2,524
|
| 60 to 69 |
1,141
|
| 70 to 79 |
360
|
| 80 to 89 |
67
|
| 90 to 99 |
6
|
| 100 Up |
0
|
| Age unknown |
18
|
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This set of three generalised categories was suggested by Dr. John Chapman (University of Portsmouth) and creates a broad distinction between dairy and beef cattle, plus calves aged under one. Data from 1900 onwards have been re-classified in this way.