T'Pol/-mirror still alive in Discovery timeline.
T'Pol born 2088
Discovery 2256
So T'Pol would be 168 and if T'Pol-mirror managed to survive, be great to see her appearing in Discovery mirror.
I've been hoping like crazy to see either version of T'Pol on Discovery. Actually since you mention it, her role was the only part of the Enterprise "Mirror Darkly" episodes that I liked as much as her Prime counterpart. Hoshi's Mirror self would have been a nice twist on TOS' "captain's woman" (I forget her name), but they already poisoned that well by using the same sexy bad girl stereotype they've used with every other female villain. (Also, Archer with Hoshi felt gross to me.)
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