Lethbridge Population by Age Group
| Age Group | 2014 | 2019 | % Change |
| 0-9 | 10,647 | 11,470 | 8% |
| 10-19 | 10,800 | 12,417 | 15% |
| 20-29 | 18,164 | 18,426 | 1% |
| 30-39 | 12,473 | 14,341 | 15% |
| 40-49 | 10,359 | 11,115 | 7% |
| 50-59 | 11,771 | 11,257 | -4% |
| 60-69 | 9,122 | 10,889 | 19% |
| 70-79 | 5,442 | 6,924 | 27% |
| 80-89 | 3,330 | 3,616 | 9% |
| 90+ | 896 | 1,027 | 15% |