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.
The dead person is not truly dead until the last person who rememebers them dies.