Related Clues:

• Long period of time
• Gets older
• Eras
• A month of Sundays
• Pieces of the past
• Indefinitely long time
• Dark __
• Census stats
• Mellows, like wine
• Reacts to time
• Mellows, in a way
• Yellows, maybe
• 'It's been ___!'
• Candle representations
• Big stretches