User blog comment:Samurixx/Cinder's age?/@comment-2600:1700:3950:3AC0:547F:E4AA:C662:B7E4-20180306033609/@comment-4010415-20180306034915

Cinder's in her early 20s. The RWBY crew told us that she's not much older than the Beacon students, and we know students graduate at about age 21. Plus, she had to look young enough to pretend to be a student. She was likely posing as a fourth year student, which would mean pretending she's 20 or 21.