I don't know how many people my age are interested in antique stores, but my husband and I enjoyed walking through. You never know what you'll find! We walked down every aisle, laughing or pointing out novel items. Some things are obviously not antique, which I wish the vendors wouldn't do, but ah well. My husband ended up buying some Star Trek action figures as a belated Christmas gift for his dad.
The shopping center is very sad and abandoned looking. I don't think this will be a must do stop for every tourist in Vegas, but if you're interested in this type of thing, it really is a nice activity to spend an afternoon on.