The rich is all the rich people, not a group of rich people. The same goes for the poor and the young. And, yes, you can rhetorically refer to practically any attribute that way.
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An0nymousOnes like: the calm, the happy, the sad, the greedy, the ugly, the handsome, etc. are not used.Yes, they are, but they are not as common, perhaps. The happy are insane. Only the lonely know the way I feel tonight. The greedy go to ****. We are free to form any group we like this way.