A quilt is only as old as the last stitch put into it. Don't mess with them, let whomever buys them do that if they so desire.
Quilts and tops tend to go too cheap on ebay. I'd try Etsy, or wait for a quilt show, get a booth and sell them there. (If you ask for a discount, most quilt shows will allow you to sell for little or no charge, for a charity)