I think it's up to the person, really.

I never wore makeup until now that I turned 30 , and now I apply it as another method to strengthen my confidence a bit. I use only very little though, because I don't want to actually earn my confidence from the makeup. It also doesn't change my features much, because generally I'm a very honest person and couldn't bear wearing a face I cannot entirely call mine.
But everything depends on the person and what she believes to be appropriate for herself.