Related Clues:

• Mature, as wine
• See 34 Across
• Reason to retire
• Fatigue factor
• Yellow or gray
• Sore point, for some
• The big 4-0, for example
• Word with information, new or old
• Bouncer's concern
• Become ripe
• Number that changes once per year
• Vital statistic
• Get old
• Grow sharper, perhaps
• Survey datum