At what age/size are jungles finished changing colors?

I'm curious so I can know what to expect.. I have decided that a jungle carpet is going to be my second snake. I find the more yellow ones to be gorgeous. Someone on another forum told me to look for a high yellow morph, but I highly doubt I'll be able to do that since Repticon only ever seems to have 0 to 5 carpet pythons. The last Repticon had 5 exactly. Three were small and two were fully grown, very brown and had head injuries.

Look for something over a year old, even as old as two and you should be left with little surprises - ontogenetically speaking. If you want to work with a younger animal it will more or less be a shot in the dark. Get pictures of the parents and you could have a fair idea, though far from any guarantee, on how your snake will appear as an adult.

check out bigger expo than repticon

There are bigger expos? I haven't heard of any others.

There are 100's if not thousands of expos each year. Now how close they are to you is a different story. I usually gotta travel between 3-5 hours to get to an expo.

Lots of breeders will ship product as well.

Most carpets get their full color saturation at a few years old... but you can kind of tell what direction they are going by their 2nd year(whether they will stay clean or muddy up/tip with black).... but all eventually darken to some degree in their later years.

As others have mentioned you can make a good guess by looking at their parents but even bright snakes will produce dark snakes here and there... and vice versa