I think it’s more analogous to our body sustaining damage it can’t reverse on its own. Think about clogged arteries or bad lungs. Using external intervention (

I think it’s more analogous to our body sustaining damage it can’t reverse on its own. Think about clogged arteries or bad lungs. Using external intervention (aka surgery), we can already remedy these situations to an extent. The methods aren’t great today (immunosuppressants suck), but soon - we’ll be able to grow organs compatible with our DNA using our own stem cells. So hypothetically, you can live eternally if you can figure out a way to solve every possible breakdown before the heart stops or neurons start dying. It’s a bit like keeping a car running forever, and maintaining it without ever turning it off. Will it be a massive engineering challenge? Yes. Will it be expensive? Likely. Is it impossible? No - nothing jumps at me that would make it impossible. For the heart and lung part, we already have ways to keep the body functioning without a working heart or lungs temporarily[1]. We can even handle failed kidneys[2]. As far as I can see, our biggest challenge is identifying the point where physiological processes stop working, causing irreversible damage. And the biggest unfixable damage is losing your memory (if the respective neurons die). Everything else is akin to changing a tires or batteries or engine. 1. Cardiopulmonary bypass machine, or a heart-lung machine 2. Kidney Dialysis