| Levels | Frequency | Percentage |
| 24 to 32 years old | 21 | 10.5 |
| 32 to 36 years old | 25 | 13 |
| 36 to 40 years old | 42 | 21 |
| 40 years old and higher | 111 | 55.5 |
| Total | 200 | 100 |