Related Clues:

• Develop wrinkles, say
• Ice, e.g.
• It's brought up on your birthday
• Store, as wine
• Bio stat
• Generation
• It's often lied about
• Birthday figure
• Number of birthdays
• Mellow, as cheese
• Paleontologist's estimate
• Many moons
• Secret stat, sometimes
• Twain's "The Gilded ---"
• Grandma's ''secret''