I do feel like the jump from "kids" looking like they're 10 to "teens" who look like they're of drinking ages is a bit jarring. But I'm not too fussed with them after almost 9 years (I also use a mod to make my teens automatically be a little shorter).
What kind of game play would they have that would be different? Is it just for the visual immersion? All the 10-12 year olds I know in RL act like teens (with the exception of being able to drive), in the fact they have the same obsession with their phones, youtube, tiktok, snapchat, and video games. The only thing they're not too obsessed with like teens are romance/crushes and fashion/makeup of some sort.