Related Clues:

• Gets mellower
• What seems like forever
• Iron and Bronze, for two
• Piles on birthdays
• 365 billion days, in astronomy
• Golden and Bronze, e.g.
• Gets better?
• Several eras
• Sentence units, often
• Shakespeare's seven
• Loses immediacy
• It's quite a stretch
• Word on a toy package
• Oodles of time
• Incredibly long time