I think
baby: 0-the months of they can walk
toddler: 2-3
child: 6-9
teen: 16-19(teens can drink in bar but youngers can't)
YA: 20-34
adult: 35-49
elder: 65+
I think the reason of EA doesn't add preteen(10-12) so far maybe this life stage is change very big and quickly IRL. But quinquagenarian may haven't problem, now the changing of adult to elder is too big
And IRL I also always seen teens have same or similar heights with theirs parents in China, include 1-7 years ago me(even many 80s or early 90are obvious taller than parents but the cause is lots of theirs parents were experienced hard period what foodstuff must buy with coupons) so I think teens height haven't problem. Now even most young teens(12-13) have same or similar heights with parents.