I am a 90s kid (or ‘90s kid or 90’s kid).
Which one is appropriate here in this sentence?
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This is a tough one - & it leads to a fair bit of disagreement.
Strictly speaking, the first is the correct form:
I am a 90s kid
However, many people would say that the second can be used because you are omitting the 19 from 1990s, so it ought to be
I am a '90s kid
Yet others [the older ones anyway] will remember back from their grammar school days that you were taught to use constructions like "Learn your ABC's" or "Mind your P's and Q's" and so would opt for
I am a 90's kid
It comes down to style & clarity quite often.
imagine the news headline
MP's debate news
MPs debate news
The first would imply the MP's debate was news in and of itself. The second that the debate was on the topic of news. The apostrophe in this case removes clarity, making the reader assume a possessive where none was intended.
On the other hand,
CD's for sale
wouldn't confuse anyone.
It may make some people itch, though not so many as
Cucumber's for sale
on a greengrocer's stall would ;)
For some further reading, try the NY Times' FAQs on Style, Grammar Monster: Apostrophes to Show the Plurals of Abbreviations or Awkward Plurals, EveryWordCounts: Plural acronyms: apostrophe or no apostrophe? or Washington State University: acronyms and apostrophes