Fountain of Youth
From Openwaterpedia
noun - The Fountain of Youth is a spring that supposedly restores the youth of anyone who drinks or bathes in its waters. Tales of such a fountain have been recounted across the world for thousands of years, appearing in writings by Herodotus (5th century BCE), the Alexander romance (3rd century CE), and the stories of Prester John (early Crusades, 11th/12th centuries CE).
The Fountain of Youth serves a metaphor for anything that potentially increases longevity.
