Even though the animals continue to work hard, what never happens although they agreed on it much earlier?

"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 for hens and geese at

five. Liberal old-age pensions had been agreed upon. As yet no animal had

actually retired on pension, but of late the subject had been discussed

more and more."