All boas yellow out to some degree as they age, normals, albinos, all of them, it's just what happens.
As for the orange, it may stay similar to what it is now, it may fade more, it may get darker, there's really no way to tell for sure besides a best guess or possibly seeing the parents (if they were albino/sunglow). I personally think he'll keep some nice color, esp in the tail and the saddles might fade a bit.
here's an old pic of my sharp strain albino (not a sharp sunglow though), she's super yellow and I love her like that.