I've never thought of it before, but all our fabric bolts are near floor level on shelves. It's never seemed a problem.
however, the cupboards that they are in have a smaller shelf above the bolts to hold fat quarters. The FQs are ones cut from the bolts that are below them so if you can't bend, all the fabrics are just above the bolts. On top of the cupboards are all the jelly rolls, more FQs, displays of various things including books, patterns, finished projects.