You can trade entropy for order, but that doesn't necessarily mean you can trade any entropy for a particular set of order, like making a specific older person

You can trade entropy for order, but that doesn't necessarily mean you can trade any entropy for a particular set of order, like making a specific older person young again, or keep a person young forever. I haven't read the full article yet but there's more to thermodynamics than just a see-saw of entropy and order; it is also a factor in chaotic systems and "time's arrow"--which is pretty deep mystery physics. Quantum mechanics works just as well in either direction, time-wise. Theoretically a photon doesn't experience time at all, and every electron is indistinguishable from another. But at our scale, many processes seem unpredictable and irreversible. Even if you could catch all the smoke a candle puts out, and you add energy to make a candle out of it, it wouldn't be the same candle. We can take a broken egg, use it fertilize grain, feed the grain to a chicken, and make a new egg... but we can't just put the broken egg directly together again. And it might be impossible, no matter what the available energy, to keep someone from aging. Beyond entropy and order, which are statistical concepts, aging is the matter of how the state of our body progresses. And managing state seems a lot harder than just measuring total aggregate order in a system.