Why when the heart or lungs or brain wear out and stop working put in new ones so you live for ever?

why when the heart or lungs or brain wear out and stop working put in new ones so you live for ever or:why when the heart or lungs or brain wear out a

why when the heart or lungs or brain wear out and stop working put in new ones so you live for ever

or:why when the heart or lungs or brain wear out and stop working put in new ones so you live for ever

or:That really won't work....there's other factors to why you die than just organ failure, and it's not like you can even replace the brain at all....a decent idea though, but then again, who would want to live forever? Not me, at least on Earth.

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