Related Clues:

• Getting ripe
• Became mellow
• Inevitable process
• Got some seasoning
• Word in a Hemingway title
• Familiar, as a joke
• Like stale jokes
• Grew older
• Like much wine and cheese
• Had time to mature
• Kept in a cellar, perhaps
• Like a chestnut
• As __ as Methuselah
• In need of replacement
• "___ Yeller"