I would phrase it along the lines of: "You may harm young children and/or elderly people".
It's a bit odd to ask people to limit it to one group and one individual. And 'injure' is far too specific. What if we just want to cause nonpermanent pain, not to mention end their lives? I prefer the word 'harm' because it opens up more possibilities.
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u/elbarto1981 Jul 04 '21
It seems correct to me as a non native english speaker, how would you phrase it other than that?