How tall would a 6'9 person be when they were13?

Answer 1

You can measure ones height to be at the age of 2. At 2 they are 1/2 of the height they will be when they are full grown. On a guy especially would be hard to tell, because they grow at different times in their teens, it is impossible to tell, unless you had your height at 2 yrs old. Hope this gives U something 2 think about.

Answer 2

There's no certain way to tell. But they would be pretty tall. Sorry but that's all I know. Maybe see how tal your parents were at that age?