| Age (years) | Number of people |
|---|---|
| 0-19 | 1,450,000 |
| 20-39 | 1,400,000 |
| 40-59 | 1,150,000 |
| 60-79 | 850,000 |
| 80+ | 180,000 |
| Age (years) | Number of people |
|---|---|
| 0-19 | 1,120,000 |
| 20-39 | 1,420,000 |
| 40-59 | 1,480,000 |
| 60-79 | 1,180,000 |
| 80+ | 280,000 |
Suggest reasons for the changes in the population structure of Scotland between 1981 and 2021.