Related Clues:

• New Day divider
• Considerable stretch
• A looooong time
• Grows wiser, e.g.
• Forever, facetiously
• Yellows or grays
• Improves, as whiskey
• Nears retirement
• Some sentence units
• 25 B.C. and 1978, e.g.
• 1 billion years
• Important periods
• 365 billion days, astronomically
• Interminable stretch
• They may be checked at the door