I personally like the older teens and I really like being able to utilize the full selection of CAS for them. If they were shorter they would need their own separate selection of outfits and that would be limiting.
I do get, however, the desire for more visual differences from young adults, so I'd like to see maybe a slouchy default posture that makes them look shorter and a little rebellious. Maybe also some new walk styles and new standing stance and idle animations that feel more immature, impatient and youthful. I feel like little changes like that could go a long way and also wouldn't be as time consuming or demanding for the long term regarding development efforts.
