Reading further on her case, it now seems obvious to me she will die from aging: in fact, all her organs age at a different rate. Her bones have around 10 years, her brain less than 1 year, all of this while she is physically 16 years old.
However I disagree on the part that complex lifeforms must die from age. Of course it is always the case in everything we see, but remember: all of our cells come from a single one, which comes from one of many cells of our parents, which in turn come from a single one, etc. All of our cells are basically the result of the successive divisions of a single cell accross generations. If cells had to wear and die, we would all be dead since millenia. Remember: individual cells (bacteria for example) divide to reproduce, and you never have one which dies from age while the other one thrives. Complex lifeforms are programmed to die, otherwise the species wouldn't be efficient. Imagine a species were all individuals are genetically immortal and can die only from injury. They always grow stronger as time pass, because they develop skills and experience while not losing from aging, and therefore are most of the time stronger than their offstrings. If we apply the theory of Darwin, old individuals are more likely to survive than their offsprings because of that, and the vast majority of the population could be thousands of years old and a infinitesimal part young individuals. Most of the genetic pool would reside in old individuals, and therefore would almost never change and would be stalled, as opposed to species whose individuals are mortal that would have a very diverse genetic pool. If a big change occurs in the environment (think climate change, such as an ice age which occurred so many times in the past hundred of millions years), the lack of diversity in the first species would have as a consequence that very few individuals would be adequate for the change. In the second species, many individuals would be adequate by pure chance. Guess which species is more likely to survive?
I believe that there might have been immortal complex lifeforms at the beginning of life on Earth (by the very reason that individual cells are by nature genetically immortal), which were replaced over time by ones would have acquired genetic mortality.
Many theories on aging exist,
one of them implying this one.
See also:
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Telomere, the loops that become smaller and smaller at the ends of DNA.
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Hydras and
turritopsis nutricula, pluricellular lifeforms believed to be genetically immortal (although it is not clear whether they would be
complex lifeforms).