Crossword Genius

Sort of milk which Methuselah enjoyed (4-4)

Ross

I believe the answer is:

long-life

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If this is the answer, I'm afraid I cannot explain it.

Can you help me to learn more?

(Another definition for long-life that I've seen is " (Of milk etc) treated so as not to decay".)

I've seen this clue in The Independent.
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