Based on prior knowledge, blood glucose levels can be used to determine a person's age group. Senior individuals typically have higher average blood glucose levels compared to non-senior adults. However, it is essential to establish appropriate ranges of values to classify an individual as a senior or non-senior.

To create the dictionary, I will consider the following assumptions:
- Adults are individuals below a certain age threshold.
- Seniors are individuals above the age threshold.

Assuming an age threshold of 60 years, I will generate the dictionary using five typical LBXGLU values for each target class.

```json
{
	"Adult": [72.5, 82.3, 96.1, 91.8, 88.6],
	"Senior": [100.7, 105.2, 110.3, 98.5, 103.1]
}
```