Related Clues:

• Mellows, like wine
• Reacts to time
• Mellows, in a way
• Yellows, maybe
• Just about forever
• 'It's been ___!'
• Extremely long stretches
• Candle representations
• Indefinitely long periods of time
• Geologists' times
• Many, many millennia
• Big stretches
• Immeasurably long periods of time
• Watches the years go by
• Aeons