Based on prior knowledge, blood insulin levels (LBXIN) can be used as an indicator of age-related changes. Senior individuals generally have higher blood insulin levels compared to non-senior individuals. 

Based on this analysis, we can create a dictionary as follows:

```json
{
	"Adult": [5.3, 6.7, 7.1, 8.2, 4.9],
	"Senior": [9.4, 11.6, 12.9, 10.7, 9.8]
}
```

In this dictionary, the "Adult" key represents the target class of non-senior individuals, and the "Senior" key represents the target class of senior individuals. The associated values are lists of example blood insulin level values for each target class.