Hey, I'm 72 and have no thoughts of stopping fabric purchases, in fact just finished painting about 5 yards and sun printing it with fern leaves. Plan on at least another 10 - 15 years of creative endeavor.
I figure my quilting keeps me off my kids backs--ha. They encourage all my quilting as it keeps me happy and they get the "fruits of my labor". grin. I keep teasing them that my stash is their inheritance, so they better take care of it. If they sell it they will all be able to retire.