Based on prior knowledge, the relationship between age and chronic heart failure can be analyzed to determine the appropriate age ranges. Typically, chronic heart failure occurs more frequently in older adults, particularly those over the age of 60. However, it is still important to consider a range of values in order to capture a diverse dataset.

Here is a dictionary with typical age values for each target class:

```json
{
    "no": [45.5, 55.2, 48.9, 49.7, 50.1],
    "yes": [62.3, 71.5, 68.2, 64.6, 65.8]
}
```

Please note that these values are just examples and might not reflect the actual dataset.