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It was said that when a Shinigami saves a human with his Death Note, that
Shinigami dies, and his remaining life-span is transferred to the human he
saved.

But imagine the following situation, a Shinigami has accumulated 500 years of
lifespan by killing a lot of humans. That Shinigami then kills someone for a
human, to save his life, and dies.

Does that mean the human would gain 500 years to his lifespan?


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2012-12-11T21:49:34.630
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death-note
What would happen if a Shinigami with exceedingly long life-span dies for a human?


Essentially yes, they will become semi-immortal. They will have a long, long
natural lives but they'll still be vulnerable to death.


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2012-12-11T22:21:12.493
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The human would indeed gain 500 years to his lifespan.

> Shinigami who die are reduced to dust, and their remaining lifespan is given
> to the human they saved. [wiki](http://deathnote.wikia.com/wiki/Shinigami)

It is very unlikely to see that human live those 500 years though. Shinigami
are lazy and don't want to be bothered with the human world too much, so the
human would become an eagerly desired target for the other Shinigami. If they
would kill that specific human they would be able to gamble for 500 more years
without having to be bothered with writing some new names.

So basically he would gain a lot of extra lifespan, but it wouldn't make him
immune to the power of the Death Note. [An example of this was seen with Misa
Amane](https://anime.stackexchange.com/a/11424/6166). Despite having gained
the lifespan of two Shinigami, she still only lived a couple of years after
their deaths, because the Death Note had recalculated her lifespan over
several occasions during the story.

* * *

As mentioned by [Madara
Uchiha](https://anime.stackexchange.com/users/27/madara-uchiha), humans with a
lifespan of 124 years or higher can indeed not be killed directly.

> You cannot kill humans at the age of 124 or over with the Death Note.
> [XXIX](http://deathnote.wikia.com/wiki/Rules_of_the_Death_Note#How_to_Use:_XXIX)

They could be killed indirectly by killing people that would result in his
lifespan being recalculated, but as I mentioned Shinigami are lazy, so they
wouldn't bother to do so intentionally, making him indeed semi-immortal :)


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I always wondered that.  
My main thought is whether they continue to age normally or if their aging
slows to match their remaining life span. I cant imagine a human who gains 500
years from the death of a shinigami could live for so long if aging naturally.  
With some deductions, I have come to the conclusion that one who gains 500
years of life from a Shinigami would have to experience aging at a slower rate
because their entire being has been extended in life by that 500 years. That
means disease, accident oh, the shutting down of organs, could not lead to the
cause of death until they used up those 500 years. So everything about that
person would either be slowed or halted in time until they can naturally die
after using the extra time. Aside from external factors such as usage of the
death note before they hit the age of 124.


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