Talk about the extinction of the dinosaurs! ;P WordStar was the first WP I learned many years ago back in the Prehistoric days when those dinosaurs were still roaming the earth.
Do you have access to a PC? If you do, and the PC has a version of Windows Word or even the DOS version of Word, you can convert the WordStar files to Word format: *.doc.
Or if by chance you have access to the original WordStar program, just convert the files to *.rtf and they will be able to be read by TextEdit on your Mac. TextEdit can also read and open *.doc.