Oldest fabric I have purchased is from the late 1970's/early 1980's...it is from a line of fabric by Marti Mitchell and the company "Yours Truly"..very old fashioned looking calico's...I don't have much left, but work a piece into each scrap quilt I make.
Oldest fabric I own is some fabric that is from the 1930's...I have worked with the repro's, but have yet to use this fabric...waiting I guess to have JUST the RIGHT project to use it in....some day...I will know when I see the right pattern!