Eight years ago Karl-Anthony Towns was in the eighth grade. Like he is now as a 21-year-old in the NBA, he was dominating a bunch of people who were smaller than him.
Check out the video of him as an eighth-grade beast posted to the Timberwolves sub-reddit. Like now, KAT was scoring from all over the floor.
Here's another video of him working out as a 13-year-old eighth-grader.