Height was also one of the things the 90's animators forgot to correct as the inners were either 16 or close to 16 during Stars.
What do you mean they forgot? Not everyone has the same height at the same age and not everyone looks their chronological age. Some 16 year olds can look like they're in their 20s while some adults look like minors, it happens. This topic is pointless because there's no such thing as "proper" aging, 16 year old inners not looking like the 16 year old outers is neither a mistake nor a flaw.