Look for synonyms for “Old people” without looking at Dictionary.
You could also try to break them into a group of explanatory terms like
ü
Elders
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Senior citizens
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Old aged individuals
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Elderly people
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Aged people
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Aged individuals
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People who are aged etc.
The objective is to prepare yourself for a situation in
which you would need to infuse different words for a single term in your
writing parts I and II in IELTS written module.