Does coffee stunt muscle growth

Its not proven. There is neither a study that shows that it may or may not stunts growth.

No one knows dont know. From personal experience: My mother is somewhere around 36 and my aunt just barely reached 21.

My aunt is five foot ten, and my mother is barely five feet. And they both have drunk coffee since very young ages.

And yes they do have the same parents, and the same grandparents and so on.

I'm not sure if its significant but I think it says something. =)