Related Clues:

• Pile on birthdays
• Time worth noting
• Chronological division
• Golden ___
• Block of time
• See 34-Down
• 15-Across, e.g.
• Consent concern
• Tide competitor
• Birthday topic
• Develop wrinkles, say
• Piece of history
• Ice, e.g.
• It's brought up on your birthday
• Bottom line?