Based on the given feature description, the feature PAQ605 represents whether the respondent engages in moderate or vigorous-intensity sports, fitness, or recreational activities in a typical week. A value of 1 indicates that the respondent takes part in weekly moderate or vigorous-intensity physical activity, while a value of 2 indicates that they do not.

To analyze the relationship between feature PAQ605 and the task of predicting the age group, we can make some assumptions based on prior knowledge:

1. Adults, who are typically younger, are more likely to engage in moderate or vigorous-intensity physical activities compared to seniors.
2. Seniors, who are generally older, may have reduced physical activity levels compared to adults.

Based on these assumptions, we can expect the following relationships between the feature and target:

1. For target class 'Adult', we can expect lower values of PAQ605, indicating a higher likelihood of regular physical activity. We can assume possible values in the range [0.5, 1.0] for 'Adult'.
2. For target class 'Senior', we can expect higher values of PAQ605, indicating a lower likelihood of regular physical activity. We can assume possible values in the range [1.5, 2.0] for 'Senior'.

Using this analysis, we can create a dictionary with the specific details as requested:

```json
{
	"Adult": [0.6, 0.7, 0.8, 0.9, 1.0],
	"Senior": [1.5, 1.6, 1.7, 1.8, 1.9]
}
```

Please note that these values are assumptions based on prior knowledge and may not accurately represent the actual data distribution.