the 3rd face is very debatable if you ask me, since most of humans are sociable creatures and don't get to be alone very often, which makes it harder to develop that 3rd face and get to know "ourselves" as we really are. Or looking from normal human life - line, you live with your parents till 18 or so, never alone and always focused on 2nd face during your teenage years. So really the question is, when does one acknowledge it's 3rd face, or do we all really develop one?
I think we can acknowledge it any time we want because that's who we really are. No need to be alone for that despite what I said. It's more of listening to the inner voice, I think.