The dead person is not truly dead until the last person who rememebers them dies.
The fountain of youth is like the monkey's paw in the W. W. Jacobs story. It never ends well.
I have mild albinism, which means I am very sensitive to light, so the animal representation of my spirit would have to be a mole. I am particularly fond of that most Lovecraftian of mammals, the star-nosed mole, and tend to choose it for online icons and avatars.