Related Clues:

• Like good cheddar
• Brought to desired maturity
• Any number of years old?
• Like bock beer
• Left childhood
• Got long in the tooth
• Like single-malt scotch
• Got a little older
• Old silver mine found at last
• Like sharp Canadian cheddar
• Rich — drunk — with a heavy burden
• Like cheese or whiskey
• Mellowed, perhaps
• Impressionist missing last letter looks back over the hill?
• Got wiser, hopefully