Crossword Genius

Living beyond 100, show evidence of age? (5)

Ross

I believe the answer is:

crust

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'living' is the definition.
(to earn a crust is to earn a living)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for crust that I've seen before include "Pie topping" , "Hard knowledge" , "Hard exterior" , "Hardened layer; pie top" , "Some bread" .)

I've seen this clue in The Sunday Times.
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