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’50’s/’50s/50’s/50s |

There’s no requirement for the apostrophe before the
“S” in decade names like 50s and 60s, since there are no
omitted letters, though it’s also acceptable to include one. The
term may be written “’50s” since “19” is
being omitted, but “50s” is fine too. Logically one should
be able to use both apostrophes, writing “’50’s,” but this
looks awkward and is seldom done. Personally I prefer to omit both apostrophes.
Writers who wish to have their
references to decades clearly understood in the twenty-first century
would be well advised not to omit the first two digits.
Note that you may have to turn off “smart
quotes” in your word processor to get a leading apostrophe like
the one in “’50s” to curl correctly unless you know
how to type the character directly. Or you can just type two and delete
the first one.