Not sure if he qualifies as an "adult" quite yet, but here's my pastel Toby... who is currently around 8-9 months old & weighs over 600g. As you can see, he hasn't browned out at ALL, and actually seems to get better with age - especially in his blushing!
Last month
A couple months ago... see how much lighter his blushing is now, compared to this pic?
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