I'm not sure the younger generation wants to learn what we have to teach them. I know my daughters were never interested in sewing. Even now, as adults, they bring all their mending projects to me. Of course, I don't mind because I love to sew. I just wonder what they'll do when I'm no longer around to do it for them. They'll probably just throw out the garment and buy new.
As for whistling with your fingers, my father tried to teach me when I was little, but I just couldn't grasp it.