Janeway is most certainly sexy. In our culture we tend to view females (to put it in Ferengi terms) to be sexier when they are young. However, when I turned 30 I lost interest in "girls" and became interested in "women". Janeway is sexy, because she is a WOMAN. In fact, I assert that only women can be "sexy" (except for a few anomalies) and that "girls" are usually just "hot"-- not "sexy".
P.S. Sorry if this post came across as chauvinistic in any way. Rest assured, I am not a chauvinist of any kind. I am however male. And testosterone is present in my circulatory system to be sure.