Related Clues:

• Ages
• Quite some time
• Candle count
• Quite a while
• Sophomore and junior, e.g.
• Long time
• Freshman, sophomore, etc.
• Age
• See 64-Across
• A dog's age
• The time of one's life?
• Millennium makeup
• Periods of time
• See 6-Down
• A long time