Telomeres, which protect your DNA from unravelling, degrade with age. I don't keep up with the aging literature but I've heard this mentioned as one of the maj

Telomeres, which protect your DNA from unravelling, degrade with age. I don't keep up with the aging literature but I've heard this mentioned as one of the major reasons determining the human lifespan. Regarding the "twice your organs" thing - think of all the concurrency issues they can now experience! A new failure model.