User blog comment:Zathronas/Speculative author: Who is Summer Rose?/@comment-5217560-20140809062848/@comment-96.254.157.84-20140810025338

Cinder and Glynda appear around the same age (roughly within five to eight years of each other, unde my assumtion) and they are both equal in terms of power. If Glynda was a lot older, she'd probably overpower Cinder.

If you watch the afterbuzz, you remember that Monty confirmed Cinder is only a few years older than the cast, leading to speculation to somewhere around the mid and late 20s. That would mean that Cinder was at least a preteen or a teenager when Ruby was born.

Monty also confirmed that Ozpin is "old as dirt" while Ironwood is only just starting to show signs of graying. Qrow is probably around the same age and starting to gray based on Ozpin's statement in the first episode.