I'm sittin here smoking a bowl and I got to thinkin.... is there a "use by" date on organs? Like, lets say this old lady dies at 90 and her liver is in great condition, do they donate the liver to someone else or not because it's so old? And if they do donate it, can they give it to a 5 year old and will it last another 85 years? When does a perfectly good liver stop being good?

You blew my mind dude.

Well if the 90 year old woman had a "perfect" liver then yes it would be sufficient to put in a 10 year old. I think 5 might be to young for an older persons liver. Theres no telling when any of the organs put into people are going to stop working. I think as long as the organ is healthy and the person who recieves the organ lives a healthy life, that organ can probly last as long as the next person.

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So if a liver got transplanted to 8 people over a span of 170 years, it's possible that it will be in near perfect condition if kept in optimum surroundings? If that's true, couldn't we keep a brain for that long? What's to stop humans from living forever?

If an old persons liver is healthy i think that you could assume that the child's body,if the liver were properly accepted,would repair it in the same way as if it were her own liver.
I think i have heard it said before that our bodies repair things really quickly when we are young and the repair ability is what degenerates with old age.
Saying all that i don't actually have a clue if its true or not

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hmm i dont think we can transplant brains...

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i know not what i talk of.

As far as i know brain tissue cant be properly repaired or repaired at all cant remember for sure.
Once a brain cell is gone its gone forever as far as i know anyway

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Im sure it would be possible IF kept in optimum surroundings. But you got to think about other people. They could have inherited liver diseases, blood problems, cholesterol, you name it theres tons of them. Not to mention pollution from where they live, and what kind of activities that person may have/not been doing. And theres always the possiblity that the body could reject it =/.

As for the brain thing, once the person dies the brain dies aswell, so i dont think theres much hope on that. But thats just what i think, im sure im wrong.

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Well, I dunno I'm sure you're right about the brain thing. The liver thing is interesting though. 50 years from now we might know someone with a 150 year old liver or something.