Based on my prior knowledge, I can assume that the age group for seniors is typically considered to be around 65 years and above. For the non-senior group, I will assume an age range of below 65 years.

Based on this analysis, I can generate a dictionary as follows:

```json
{
    "Adult": [20.0, 35.0, 45.0, 50.0, 60.0],
    "Senior": [65.0, 70.0, 75.0, 80.0, 85.0]
}
```

Please note that these values are just for demonstration purposes and may not necessarily represent the actual age ranges for each group accurately.