Sorry, I'm not familar with "outdated fabric". I've been quilting for years and my fabrics are stored by color, design, manufacturer, etc. I'm sure some of the fabrics in my juvenile drawers are years and years old, but they are comfortable sitting with the fabric I bought last week. When I'm "pulling fabrics" for a project I match the fabrics without regard to the age of the fabric. Hold on to that "outdated fabric", one day it'll be just the piece you need to complete a project.
P.S. don't let your fabric hear you refer to them as outdated, ugly, faded, tired, etc. they don't like it - fabrics have feelings too.