I haven't had them long enough to have raised a 20 year old from an egg, but I do have some older snakes. It seems the older they get, the less food they seem to need, growth rate slows, and the fasts last longer. My oldest girl fasted for around nine flipping months. She lost some weight but nothing that really scared me. I don't really start to worry unless they lose body tone.
Once again my data is limited. Hopefully some of the long time keepers chime in.
My advise would be don't offer for a couple weeks.
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