Good luck with your older snake. I have a 25 year old, so I'm always very interested in these kind of threads. Seeing what the future holds. I haven't noticed the specific issues you have, but over the last year mine chooses to eat much less frequently. Used to be a medium f/t rat every 7 to 10 days, now it's a small f/t rat every 2 or 3 weeks. Eyesight and other senses appear to be normal.
Good luck to you and your snake.
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