There is a fountain of Youth

And I found it in Korea (and I would guess at most Buddhist temples).There are a few things that you will find at every temple, and one of them is a well full of communal spring drinking water.

Locals believe that if you take a sip from this life giving water you will add one year onto your lifespan. More a metaphor in the modern age for the importance of drinking water, locals still take a sip every time they visit the temple, just in case.