This would have to also incorporate a slightly larger size. I do have one granddaughter who is very petite. She is nine years old, and her five younger sisters will soon surpass her in height. But this is a rarity, to be sure. I do like the notion that bodily development could be included to help show they are maturing, though. Maybe something in CAS? As in the player calls the shots?
I recall not being satisfied with the Teens in Sims 3. They were entirely too short to learn how to drive! I like how tall they are now; however, they appear to be between 17-19 years of age. Not a bad thing, but they skipped a stage, you know?
I do hope EA can make this transition in Sims 4, as I don't expect to move on. We are facing retirement, you see, and that will grossly curtail our expendable income.