I have many workflows with (Previous Version: 1/1/2015... ) etc.
Is there a downside to deleting these previous versions? I read this post by Nik Patel: link where he says:
You can’t manage (or delete) work flow status columns from the list settings page, site columns gallery, or site content type gallery.
However I don't seem to find these columns in lists which have many previous versions of workflows.