Like if you want to say old people, you can also say senior and older? How about young people?
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One of the definitions of youth is
- young persons collectively.
You can also use young as a noun:
those who have youth; young persons collectively: the educated young of today; a game for young and old.
And finally (if the people you want to talk about can be put into these categories) you can also use: children, adolescents, or young adults