This is a quote from the book "Animal Farm" by George Orwell
...erbs which she prepared by chewing them, and both she and Benjamin urged Boxer to work less hard. “A horse’s lungs do not last for ever,” she said to him. But Boxer would not listen. He had, he said, only one real ambition left — to see the windmill well under way before he reached the age for retirement.

At the beginning, when the laws of Animal Farm were first formulated, the retiring age had been fixed for horses and pigs at twelve, for cows at fourteen, for dogs at nine, for sheep at seven, and ...

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