Board Thread:General Discussion/@comment-26099499-20150226151824/@comment-26397825-20150831095437

Another hole in the 'she doesn't look old enough' theory; the artstyle does not allow for their ages to be shown effectively. Seriously, look at just Glynda's face, and put it next to a picture of just Weiss's face and just Ruby's face. They all look roughly the same age. The difference is that Glynda's voice, actions and clothing are much more mature when compared to that of Weiss or Ruby, which puts in mind a lady who is somewhere in her mid-30s to early 40s. Raven herself might not be wearing such classy clothing, but it doesn't mean she isn't just one of these parents who are in their late 30s-early 40s and yet still wear fashionable and 'young' clothing.

So again, the artstyle does not allow for age to be shown effectively, which leads to cases like this and Cinder, who was theorised to be anywhere from the girls age to Ruby's mum.