I have a couple of quilts that my grandmother made (circa 1950's) and they are still in good shape. I try to take special care with them, but they are used regularly. I have a couple made in the 60's that are the same way. I have the first quilt I ever made and use it all the time as a picnic quilt. The only ones I have seen that have a problem are the ones with poly batting that were put away and never used. The poly just completely disappeared. when taken apart it was like powder inside the backing and top. So, I think it depends on the quality of materials, the use the quilt gets and the care taken to preserve it.