Though the old steed is old, its ambition reaches a thousand miles.
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From Cao Cao's (曹操) 《龟虽寿》: 老骥伏枥，志在千里；烈士暮年，壮心不已 - 'The old steed in its stall still longs for a thousand-li ride; the hero in his twilight years still burns with ambition.' One of the most quoted lines on aging gracefully in Chinese.
