Related Clues:

• Many a year
• Cause of some spots
• Generation
• It's often lied about
• Birthday figure
• Stone and Iron, for two
• Number of birthdays
• Mellow, as cheese
• Paleontologist's estimate
• Many moons
• Secret stat, sometimes
• Memorable times
• History makeup
• Twain's "The Gilded ---"
• Gets grayer