Related Clues:

• Long time
• Years and years
• Pitcher's pride
• Cenozoic, e.g.
• Age
• '___ Yes!' (old political placard)
• One for the history books
• Period in history
• Extended period
• Elizabethan ___
• Christian ___
• Ballpark fig.
• Two or more periods
• See 64-Across
• Stat. that's good when low