We have no idea if teenagers will turn 18, we have no idea if they will reside in said district at 18. We can predict population migration trends fairly well, why shouldn't we draw based on those?
Can you accurately account for where all these children will end up? I'm saying drawing maps that exclude children to cover a period of time where you know those children will become eligible voters is ridiculously unfair.
What you said here:
"we have no idea if they will reside in said district," is exactly what I was getting at - we
don't know, and therefor we should just assume they will stay put. Of course not all of them will, but we have not ironclad way of knowing where they will be past 18. Not including them in redistricting at all is boneheaded if you ask me - to ignore citizens who are, lets say, 17 years old at the time the map is implemented, then they turn 18 less than a year later and they stay in their district, but now their existence was ignored by mapmakers because they didn't meet this deadline despite the government knowing ahead of time that they would. I dunno..
As for your second part it isn't fair, those individuals get their representatives. It doesn't change that, but California 40 has more non-voters than voters in it. And half as many voters as other congressional districts, why should voters there have a more important vote? That's not how democratic republics are to work.
This argument I have some sympathy for. This type of situation creates a lot of eligible voter/non-citizen imbalances. Personally I've wanted us to give these people pathways to citizenship so we can eliminate that problem, but doubt that will be a reality anytime soon.
For sure California and Texas would probably object to any attempts to switch to only counting citizens. They would stand to lose Congressional representation because of it.
People
here, in this thread? I can't speak for the older folks, but most of us weren't even alive, let alone teenagers during these times. And gerrymandering has gotten a lot more sophisticated over the past 2 decades.
I don't find it hypocritical or funny. I'd have objected then to Democrats as well.