How long could the organic components of part-mechanical, part-biological beings last if said beings didn't naturally eat food?

I have characters in mind for a science-fantasy setting which are mostly what you'd call mechanical/robotic, but that also have muscles in their major limb joints, as well as a cardiovascular system and lungs in place to support said muscle tissue. The main power source for these beings is a crystalline core implanted into their hull at conception, which delivers a constant electrical charge for, on average, 80+ years.

However, these beings do not sustain their organic tissue through eating food.

Could organic tissue last for that long without sustenance? How long would it take for it to degrade? What could be different about it compared to organic tissue in our world that would prolong its lifespan?

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How long could the organic components of part-mechanical, part-biological beings last if said beings didn't naturally eat food?

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