I read article today on a species of jellyfish called turritopsis nutricula. It may the only animal to have found the fountain of youth.

This is a picture of the beauty is given below.

Immortal Jelly Fish (Turritopsis Nutricula)

It achieves immortality by a process called transdifferentiation. You can read more about in here

• Yahoo Article : The world’s only immortal animal
• Wikipedia entry : Turritopsis nutricula