Yes, I have definately noticed this. I believe the darkening in color comes with growth not age.
I have seen a few examples of this but my best example is a pastel that I rescued. it was 3 years old, and not much bigger then a hatching because the guy had no idea what he was doing. When I got the snake it ate like a horse and VERY quickly got up to a normal size for its age. It also, at an unbelievable rate, got dark, like pastels often do.
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