Do Woma's Heads Turn More Yellow With Age?

Does anyone happen to know if Woma's heads turn yellow as they age? I was just wondering, because both of my hatchling Woma's heads are more of an orange-ish color...

Sheila:

http://www.sinisterserpents.com/imag...s/Sheila-1.jpg

Steve-O:

http://www.sinisterserpents.com/imag...es/Steve-O.jpg