Related Clues:
- Periods in history
- Many, many years
- Passport, license, etc.
- Check-cashing needs
- An eternity
- They may be sought-after in bars
- Fliers' requirements
- Admission requirements, sometimes
- Word with Dark or Middle
- Many offer a DOB
- Census statistics
- They're checked at checkpoints, in brief
- Dog tags, e.g.
- Quite a stretch
- Eternities