Older Adults' vs. Older Adults': Which is Correct?

The correct expression is 'older adults'.

When indicating possession for the plural noun 'older adults', we typically add an apostrophe (') to the end of the noun. This is because 'older adults' is already in plural form, ending with 's'. Therefore, simply adding an apostrophe is sufficient to indicate possession.

Hence, the correct form is 'older adults', signifying something belonging to older adults. For instance, 'older adults' health' refers to the health of older adults. Note that an extra 's' is not required after the apostrophe (').