| The point about negligible senescence was just to prove that aging isn't a biological necessity. There are animals that don't age, which means aging is neither evolutionary necessary nor undefeatable. If we get to the point where we can edit genes, we could do it intelligently. Certainly better than random mutations and selection over tens of thousands of years. Organ transplants are not trivial, but it's possible we could improve surgery and anesthesia, as opposed to curing aging directly. a) I did mention that this wasn't a cure for aging, just a life extension. You've eliminated basically all the diseases that occur below the head and this would extend your life a ton. b) It's been shown that younger blood rejuvenates brain tissue a lot: https://med.stanford.edu/news/all-news/2014/05/infusion-of-y... And cancer from regenerative therapies wouldn't be as much of an issue if you are in a younger body with a fully functioning immune system. It's also possible we will eventually be able to tweak the parameters of the immune system to help with that cause. c) You can slowly add in younger brain tissue as older stuff dies. There was a study where they replaced all of the glial cells in living mice with human glial cells, just by injecting them with stem cells: http://www.medicaldaily.com/bringing-human-brain-mice-glial-... But you can also add new neurons over time too as the old ones die. This isn't as bad as it sounds. The new neurons would learn the patterns in the old neurons. Memories are highly distributed in the brain - you can cut out half of your brain and still function normally and remember everything. Most of your memories and personality would persist even as you replace your entire brain. Cryopreservation is believed to preserve most of the information in the brain. The connectome is definitely preserved. Information contained within the cells is probably preserved at such cold temperatures, if it's even necessary. In the future it's very likely they will have the technology necessary to reconstruct a brain from this information. Reviving the brain tissue itself might even be possible because of how much is preserved, and how advanced technology might be. |