Related Clues:

• Census stats
• Lengthy time unit
• A long long time
• It's going to be quite a while
• Mellows, like wine
• Reacts to time
• Mellows, in a way
• Yellows, maybe
• Just about forever
• Stereo control
• 'It's been ___!'
• Candle representations
• Many, many millennia
• Big stretches
• Astronomical time period