Related Clues:

• Get gray
• See 66A
• It's 'just a number'
• Golden, for one
• What the number of birthday candles signifies
• Yours gets a yearly increase
• Go gray, say
• ---
• Cause of some lines
• Bronze, Copper or Iron
• It can't go down
• Turn gray, say
• Auden's ''The ___ of Anxiety''
• Get mature
• Progress toward maximum drinkability