Who is left after all these years?

"Clover was an old stout mare now, stiff in the joints and with a tendency to rheumy eyes. She was two years past the retiring age, but in fact no animal had ever actually retired. The talk of setting aside a corner of the pasture for superannuated animals had long since been dropped. Napoleon was now a mature boar of twenty-four stone. Squealer was so fat that he could with difficulty see out of his eyes. Only old Benjamin was much the same as ever, except for being a little greyer about the muzzle..."

After a few years, the only animals that even remember the Rebellion are Clover, Benjamin, Moses, and some of the pigs.