MarkL - age is irrelevant for this in my experience. I've got a 4+ year old male BP whose belly button is still evident and all of my others have it visible if you look in the right spot, though some are more obvious or noticable than on others.
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Cool I’ve never seen that on any of my snakes. Only two have white bellies though so probably hard to see on the others. My eyesight must be worse than I thought