Not sure what you mean by demographic but SCCA marketing dept has or had a report for potential advertisers that broke down some demographic (from a marketing perspective) data.
Contact Colan Arnold with your request. His department can provide you with a csv file that may or may not be true data compatible depending on your product. You'll need to provide reasoning for need.
He can supply that. One problem they have is many member records do not have dob populated. The field is blank, which can be a problem if you're using something other than a spreadsheet.