Well i don' think so .When you a kid you muscles are not as big than a teenagers muscles. Therefore I think a teenager's muscles haves a different percentage then a kid.
No, because when your a kid your muscles aren't fully developed as they would when your a teenager.
depends with the age
A teenager or a young kid.
Yes, you should wait until age 16 to do serious weight lifting.
if your not a teenager don't do it but if you've had it since you were a teenager and your not past 40 its ok
Yes, or a very young adult.
No.
it was a young teenager.
No
You get to be young grandparents!
yes
no, only young adults +