Based on the given feature description, PAQ605 represents whether the respondent engages in moderate or vigorous-intensity sports, fitness, or recreational activities in a typical week. The values for this feature are numeric, with 1 indicating that the respondent takes part in weekly moderate or vigorous-intensity physical activity, and 2 indicating that they do not.

To analyze the relationship between the feature and the task of predicting age group (senior or non-senior), we can compare the distribution of PAQ605 values for each age group.

After analyzing the data, we can create a dictionary that shows the possible values of PAQ605 for each age group.

Based on this analysis, here is the dictionary:

```json
{
    "Adult": [1.0, 1.0, 1.0, 1.0, 1.0], 
    "Senior": [2.0, 2.0, 2.0, 2.0, 2.0]
}
```

In this dictionary, the "Adult" key represents the age group of non-senior individuals, and the "Senior" key represents the age group of senior individuals. The values in the lists represent the possible PAQ605 values for each age group. In this case, for the target class "Adult", all the possible PAQ605 values are 1.0, indicating that non-senior individuals are more likely to engage in weekly moderate or vigorous-intensity physical activity. Similarly, for the target class "Senior", all the possible PAQ605 values are 2.0, indicating that senior individuals are less likely to engage in such activities.