If the movie ever mentions how long the Na'vi have been around as sentient creatures, I missed it entirely. It did mention that before Jake Sully, there were f

If the movie ever mentions how long the Na'vi have been around as sentient creatures, I missed it entirely. It did mention that before Jake Sully, there were five Toruk Maktos since the beginning of known history, and the most recent one was Neytiri's grandfather's grandfather. Based on that, we might expect recorded history to only go about twenty (or twenty-four?) generations back.