Related Clues:

• Paleontologist's estimate
• Many moons
• Secret stat, sometimes
• Yellow or redden, perhaps
• Twain's "The Gilded ---"
• Grandma's ''secret''
• Space ___
• Bronze ___
• Admission restriction, usually
• Application form question
• Six, say, for a first-grader
• Ice is one, information another
• Geological period
• Important time
• Turn red, maybe