You bet, they must be selling because the manufactures are still making full-cut panty briefs. In fact I own a few pairs of panties in that style that I wear ... Though usually I wear hip-huggers. But I still like full-cut panties .... Maybe that is because they remind me of my younger years and when I got my first pair of panties.
Iam a woman of 35 - I don't wear the granny type pants but I do wear white full control shapewear type knickers. They are an elastine type material with lace on front and are a bit smaller than bridget jones type underwear and do have a big gusset on them. I do prefer them to thong type underwear and they are very feminine and look great under sheer glossy tights while iam wearing a pleated skirt.
Maybe some older women do.
They still have them in the stores so they got to be comfortable and I'm not telling you what some woman buy them for since you can't polish an apple with a thong.(I'm sure you know what I mean ladies)