An old horse in its stall still dreams of a thousand li: Grandma is over seventy and still attends a university for seniors.
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The second half of 曹操's line in 龟虽寿: 老骥伏枥，志在千里, 'an old steed in its stall still dreams of a thousand li'. The next lines say a man of spirit keeps his bold heart in old age. On its own it is praise for anyone who aims high.
