Here are some potential issues identified in the dataset based on the hint provided:

```json
{
    "issue": "Inconsistent party_code value",
    "evidence": "party_code values in `data_aging_congress.csv` include 100 and 200",
    "description": "The party_code column contains values 100 and 200 without a clear explanation in the README file. These values should be clarified as to what they represent (e.g., which political parties)."
},
{
    "issue": "Potential incorrect age_years calculation",
    "evidence": "age_days: 19626, age_years: 53.733060 in `data_aging_congress.csv`",
    "description": "The calculation of age_years might be incorrect as it does not appear to be a simple division of age_days by 365.25. For instance, dividing 19626 by 365.25 equals approximately 53.73, which should be rounded appropriately."
},
{
    "issue": "Generation categorization inconsistency",
    "evidence": "Generation values such as 'Greatest', 'Lost' in `data_aging_congress.csv`",
    "description": "There is a potential inconsistency in the generation categorization, as some members are listed under different generations that might not align with their birth years. Detailed verification is needed to ensure each member is correctly categorized based on the provided definitions."
}
```

These issues should be addressed to ensure the dataset's accuracy and consistency.