"others" would be OK. "youngest" is also possible. "other" and "younger" are both wrong.
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english1It's not impossible for "the younger" to be used as a plural noun, but this is done mostly in parallel structures with "older" ("The older are wiser; the younger are dumber") and/or general statements about large numbers of people, typically sections of society. In your sent
Thank you. But could you please explain why "younger" is wrong?