Related Clues:

• Celebrates a birthday
• Yellows, or mellows
• Yellows or grays, say
• Times and Guardian editors selected leaders therefrom
• An awfully long time
• ". . . for children of all ___!"
• Turns mellower
• "Rock of __"
• Yonks
• Puts on years
• Eon segments
• It's a long time
• Biographical data
• Sage (anag)
• Prolonged periods