You can't just throw out names of Individuals and say that lifting at a young age will not stunt growth. Shaquille O'Neal, David Robinson, Karl Malone, Michael Vick are all not exactly your average human in terms of Physical stature. Every one is different and matures physically differently.

Lifting to much weight to young will lead to Injury, at a young age in terms of your physical development, there is not set age when this changes though and the best thing to do when you is to keep the weights relativly light and moniter your progress. I will admit that in terms of bone development I do not have the knowlodge to even comment on it.