I had a friend from 7th grade forward. He was around 5'6" at the end of 8th grade and when I saw him again on the campus of our high school, I was astounded. He was 6', or close to it. Just over the summer he shot up like nobody's business. Females grow until they're about sixteen. Males, however, can continue to grow until about age 21 years. My boys certainly reached their final height in their teens. I grew a whopping half an inch in high school. I'm a tall, short person at 5'3 1/2". Hey, at least I'm taller than my daughter, but only by that half inch. LOL
As for the Sims, if I am creating them at that age in CAS, I will very often give them narrower shoulders. But not always. Some guys are just built in the teens. It's a very subjective subject.
But, if EA decided to give us sliders, that would be cool …
