Janeway looked so much better with the short hair and some more color to it. That bun didn't do her any favors. I think part of the age thing is also in how they carry themselves. Belana has all that fire and attitude, so you don't really picture her being much older. Plus, the way she doubts herself is more like a young person not someone who has gained confidence with age. Janeway has a calm certainty to her that makes her feel older. There's a confidence about her. She exudes it.