The vast bulk of majors either lacks the ability to get into it so early ("I've been civil engineering since I was 9!"), women get into them just as easily ("I've been into biology for a while now"), or it sounds really lame when you brag ("I've been making lumps of indistinguishable chemicals with chemistry sets since I was nine"). I wouldn't be surprised there's a couple of others that have at least a trace of this problem.