An interesting implication of the Many Worlds interpretation of quantum mechanics is immortality of sorts. I tend to favor the Many Worlds interpretation for several reasons.
As with the Schrodinger cat, where under the Many Worlds interpretation, the universe bifurcates, with the cat being dead in one copy and alive in the other, you the observer also bifurcate with the universe, and if you're the copy in which the cat lived, you see the cat alive. If you are the copy that is in the universe where the cat died, then you see the cat dead.
What if the observer and the observed are the same? One could look at biological death as being the outcome of some quantum event; it could be an event either cased a DNA strand to break or not, and that strand might have coded a critical region that encodes a protein that signals to limit cell division, the absence of that protein results in uncontrolled cell division, cancer.
As time progresses there is a series of events in your life; and each time the universe bifurcates; and each time one copy of you survives and goes on. I can see no logical conclusion to this process, no reason it would not continue indefinitely and one copy of you would live on forever.
There is still a lot up to interpretation. From an external standpoint in most universes, people would see you (or me) die. Now, when the quantum event happens, the death event, do you in fact bifurcate, or because that event is the death event, only one copy goes on while the universe splits? I guess what I'm really wondering is what is the subjective experience?
And that of coarse is assuming the many-worlds interpretation is in fact the correct one, but I prefer it because it eliminates many paradoxes and my general view of something paradoxical is that it really just means we don't understand it sufficiently well or there would be no paradox.