[ WP ] Two people discover a fountain of youth . The problem is that upon drinking the water you turn back into an infant . The two decide to take turns raising each other in order to live forever until one day one of them decides to break this agreement .

`` An infant, yes. No more than a few weeks old'', I explained wearily, as though the word itself was what was causing the confusion. 
 
 `` Childhood Amnesia sets in as the brain starts to change around age 4. You are never burdened with being a baby, and your child's brain begins to understand. Begins to remember. But memories are... fuzzy. Disjointed. It is as though you realize something about yourself, but ca n't place it. Meanwhile you play, you learn, your brain expands. As time goes on, your memories become clear. You remember it all - your talents, your knowledge, the wisdom that comes with age. Your brain remembers. Your body can be quickly retrained. And by the time your teenage years set in, you will be the same person you were before you drank - but with a mind that can soak in knowledge as fast as you could as a child. The drive of an adult set upon the youth of a teenager.'' Eagerness. A tenuous trust. One more push. 
 
 `` The downside, of course, is that immortality comes at a price. You watch those around you die, you are born into a world that ever grows around you, and that you have to re-acclimate yourself to as it changes despite you. I understand that all too well, as I have been doing this for... well, for a long time. However, you can see the future. Learn everything there is to know. Build wealth beyond your dreams. And should you ever wish to see what comes next - as my wife did - you need only not drink.'' A nod. What I was waiting for. 
 
 `` And so, officer, you have two choices. You can take me in, and forget all you've heard today. With the wealth I have that you know about - and believe me, that is merely the tip of the iceberg - I will be out in no time. You know this to be true. I will vanish, and you will never hear of me again.'' A slow smile. Signs of understanding. 
 
 `` Or, you can adopt a child. Take it into your family. Raise it well, in accordance with my instructions. I will see to it you are financially taken care of. You are still young, you have a long life ahead of you yet. When I am once again old enough, I will take you to the fountain, and show you how to use it. I will raise you to adulthood, and we can continue the same cycle every half century until one of us chooses their own end, and the other finds a new partner to continue the cycle.'' 
 
 I of course know the truth. Insanity sets in quickly as they learn they are trapped for a decade inside a child's body after they awake. It was a miracle that I survived it the first time, but after the dozenth, I learned to bear it gracefully. The price for immortality is to live a life of madness, and decide at its end to subject yourself to it again. So far, I'm the only one I've encountered that has taken that path. The fountain is well hidden, but not impossible hard to find - I doubt I was the first. Maybe she will continue with me beyond a single lifetime, but I doubt it, and I have plausible deniability on my side. She will most likely be the next in my long string of `` partners''. A tinge of guilt yet remains despite the repetition of this, but I know she will serve her purpose well, and it's not as though she would get a second chance at life without me. I put on a convincing smile, well practiced after my hundredth lifetime, knowing the inevitable end. 
 
 `` So, officer. What do you say?''
