After analyzing the relationship between the LBXGLU feature and the task of predicting the age group, it can be inferred that higher blood glucose levels might indicate a higher likelihood of the person being a senior. However, it is essential to note that the specific ranges of values for LBXGLU distinguishing between the two age groups might vary depending on the context and dataset.

Based on this analysis, the possible values of the LBXGLU feature for the target classes 'Adult' and 'Senior' are as follows:

```json
{
	"Adult": [78.5, 85.2, 92.1, 99.8, 106.3],
	"Senior": [105.5, 114.9, 123.6, 130.2, 139.8]
}
```

Please note that these values are just examples and might not accurately represent the specific ranges of LBXGLU for each age group in a real dataset.