I would probably make a jeans quilt with flannel on one side so it isn't quite as heavy. It's one thing to lie under a jeans quilt when you're a youngster and quite another to lie under that weight when you're in your 90's! Some people do find the weight of a jeans quilt comforting, but I still think there would be some limits as to what would be comfortable for an older person with thinner skin and less padding between skin and bone.
There are some great websites that talk about making jeans quilts. Be sure to Google them for ideas, pictures, patterns, and tips.