I believe that the four sentences below are impeccably punctuated, along with their variants. Agreed?<br/><br/><br/><i>The greatest 80s actor was arguably Sylvester Stallone.</i><br/><br/><br/><i>The greatest eighties actor was arguably Sylvester Stallone.</i><br/><br/></br><i>*****</i><br/><br/><i> </i><br/><br/>But because of the word order in the two sentences below, we need to use the apostrophes in each.<br/><br/></br><i>The '80s' greatest actor was arguably Sylvester Stallone.</i><br/><br/><i> </i><br/><br/><i>The eighties’ greatest actor was arguably Sylvester Stallone.</i><br/><br/><br/>Thanks.