How old should my son be before I introduce him to the Organon of Aristotle?

[delsydebothom]

It will be a very long time before he can, but I would like, once he is old enough, for my son to learn logic using the Organon. I'm wondering what the mean age is at which most children can comprehend the most important aspects of say, Categories.
jateef...You're right, he's learning the rudiments of logic now. On the other hand, there's nothing like a good formal instruction to allow him not only to formulate arguments correctly, but to act as a gateway to higher philosophy, should he be interested.

Anyway, thanks for your answer!