User blog comment:Samurixx/Cinder's age?/@comment-4010415-20141203165823

She's in her 20s. Remember that the students start Beacon at 17 and attend the school for 4 years, which means they graduate at 21 years old.

The RWBY crew has said that Cinder is not much older than the students, only a few years older at most. So, she's in her 20s, probably pretending to be a 21-year-old senior student.

Even if Roman is older than her, though, she's very powerful and very threatening, and he's probably getting something he wants out of this whole deal, so of course he's taking orders from her.