80's or '80s

Several decades ago you would write e.g. the 50’s or 1950's with an apostrophe but that is going out of style and the figures with an appended 's' e.g. the 80s or 1980s is more common. A preceding apostrophe to signal the omitted first two figures e.g. '80s is also possible. It's really just a stylistic choice. If writing academically or for publication, adhere to the appropriate style guide. The safest choice, if writing for a general readership, which is never wrong, is to avoid apostrophes altogether. Alternatively, and some would say better, write the word, e.g. 'the eighties'.

'70, I'm continually astounded at the depth of your q's

My immediate reaction: " '80's " but let's see what Cen sez

...but was a band

Right, Cen ?

Was or were. Both are possible.

Yea Cen, but tech corr'ct ??

Yes.

Thanks Cen, glad we havya