Related Clues:

• Birthday figure
• Number of birthdays
• Mellow, as cheese
• Paleontologist's estimate
• Many moons
• Secret stat, sometimes
• Twain's "The Gilded ---"
• Grandma's ''secret''
• Space ___
• Bronze ___
• Admission restriction, usually
• Application form question
• Like wine
• Matured, as wine
• Six, say, for a first-grader