Originally Posted by
achilles
Eh, the age thing is a bit weird, but I'm more willing to cut them some slack there as this is a thing they've actually bothered, though never in an organized manner done with intent, to set the groundwork in that PG has previously been shown to essentially either not age at all, or do age so very slowly that it's really hard to tell on mere human timescales that she's at all older from one decade to the next. There have been enough future PG stories where other human characters have aged, but she hasn't, or hasn't aged much compared to the human characters. And it's been shown to be that way for Kryptonians in general. Where this becomes interesting is that a 70s vintage PG still around, who still looks exactly like she did back in the 70s, should have a lot of experience, and should be in general a LOT tougher than she was when young and inexperienced---more contrast with SG, and possibly even a bit with Superman himself, if weirdly he's now younger than Kara, (PG---she's Kara to me rather than Karen).
If I had to guess from what's gone before, I'd say PG would age, but so slowly she'd probably still be a thing around the time of the LOSH. Though they've very carefully kept her away from THEM as much as possible; in fact, I can only recall one story where she had any significant interaction with members of that team----other than that, they're the territory of Supergirl. Which is interesting, since they've never bothered to keep Supergirl away from Power Girl related properties. But whatever, this is hopefully the start of a new era where Power Girl and other previously marginalized but viable characters get their just due finally.
Honestly, if I were WB, and I was looking for a Kryptonian female character to use in a live action movie or streaming show, I'd go to PG rather than SG----she's got some basic framework attached, but she's more of a tabula rasa than SG as far as the general public goes. Which means that while they'll know in general what to expect from her the instant they see that jacket with the "S" on it, or any other variation, (and while I don't necessarily agree with WB/DC on this, I can see where they're coming from with the "S" shield redesign), but the details are up for grabs, free for a creative team to define. That said, the record of even halfway decent writing, never mind actual good writing, in movies or streaming as of the past few years doesn't inspire one with confidence. Dread, perhaps, but not confidence.
That said, assuming a good writer could be found who understands the character and is willing to put the thought and work into making her a likeable onscreen protagonist who could attract audiences the way Evans did as Cap, or Downey Jr. did as Iron Man, or ScarJo did as Widow before they squeezed out her solo movie five years or more too late... you could have a potential mid-range or lower budget movie or streaming show with PG----who doesn't carry any of the baggage SG does. Especially as Benoist has established SG fairly firmly for better or worse, while PG is....aside from a few core character traits, powers, and some basic backstory---free for any ambitious writer WB likes to define.