Based on the feature description and task, it is not clear what LBXGLT represents. In order to analyze the relationship between feature LBXGLT and target age group, I would need more information about the feature itself.

However, I can still create a dictionary with typical LBXGLT values for each target class, based on assumptions. Here is an example:

```json
{
	"Adult": [1.2, 2.5, 3.1, 4.7, 5.2],  
	"Senior": [2.0, 2.8, 3.5, 4.1, 6.3]
}
```

Please note that these values are arbitrary and do not represent any actual relationship between the feature and target. It is essential to have a clear understanding of the feature and its relationship with the target variable before performing any meaningful analysis.