The Lord of the Rings Reader's Companion, p. 692:
1044 (III: 324). Aragorn indeed lived to be two hundred and ten years old - As first published this passage read: 'Aragorn indeed lived to be one hundred and ninety years old'. It was revised in the fourth or fifth printing (1966) of the Ballantine Books edition, but not altered in a primary edition until the HarperCollins resetting of 1994.