Related Clues:
- Unimaginably long stretches
- Improves, as wine
- Turns yellow or mellow
- Earth's age, perhaps
- Geologic procession
- Becomes less green
- Sits in a wine cellar
- Gets along in years
- Rock of ...
- Eternities, seemingly
- Historic periods or prolonged time
- 'Rock of ... ' (hymn)
- Divisions of archaeological time
- Prolonged periods of time
- Grows old like sage