Nobody really knows for sure, but since he's about 14 or 15 in Birth by sleep (which takes place ten years before the first Kingdom Hearts game) I would say he's about 25, give or take a year.
They never say how old he is
Le Saix's population is 92.
The area of Le Saix is 22.15 square kilometers.
Saix's real name is Isa, as revealed in Kingdom Hearts Birth by Sleep.
bluish grey
*SPOILER ALERT*Yes, Saix is eliminated by Sora in The World That Never Was, during the events of Kingdom Hearts II.
Saix's claymore
Saix is the nobody to Isa. He and Axel's original, Lea, are first seen in Kingdom Hearts, Birth By Sleep. He was not someone already known through out the previous games.
His real name was Isa
Yes, because Anti-Saix has a higher defense and attack. When you weaken him, I think he becomes just Saix.
Yes. It's Luna Diviner.
His real name before he became a nobody is Isa.