Gave this some further thought (yeah, I think a lot, see above post.)
I never actually saw what I currently looked like in any of the mirrors.
Maybe, if my true form was pure sentient ageless/timeless/indestructible energy, I could pass through the mirror into these 'past lives' of mine. It would be complicated, the whole space/time continuum thingy, like would those in the past still have a portion of my soul, or my having 'moved on' would they be souless? Just a historical 'reenactment'? Could I control them, or would it simply be reliving the experience? Like a living memory, unable to change anything?
That just caused my brain to freeze-up...must reboot :)