Related Clues:

• The five in a lustrum
• Units of time
• With 37-Down, way back when
• Quite a long time
• G permits them all
• Century parts
• There are five in a lustrum
• Gets old
• Grows more antiquated
• All ___ (words on a game box)
• Times of your life?
• Particular periods
• A seeming eternity
• Decade's 10
• Dog __