I used to belong to a professional quilters group. One of the members publishes a newsletter for other quilt professionals. She brought back similar stats from her visit to the big Quilt Market in Houston several years ago. Having attended a large quilt show in Hershey PA last week I would say the people I saw there pretty much fit the criteria. Advertizers etc. spend a lot of money doing surveys so that they can target their markets. The older woman whose family is grown and out of the house usually has the most disposable income for an expensive hobby like quilting as well as the space for fabric and equipment.