Green tree python color change

Around what age do most GTPs change from Red/yellow to green? Is there any difference in color change timing based on locality? I've heard that Biak take longer and are older before changing and that Aru tend to change earlier/younger. Is this true?

Pretty much anything other than a Biak will tend to change colors around a year old. Biaks can take up to 5 years to change color...or so i have been told by a multitude of Biak owners. Pat is just over a year old and he is just starting to get a couple green dots on him.
https://ball-pythons.net/forums/cach...8f2eb2eb_h.jpg