Fountain-of-youth meaning

A legendary spring supposed to restore the health and youth of anyone who drinks from it: it was sought in America by Ponce de León and other explorers.
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(idiomatic) Anything reputed to have the power to restore health and vitality or to restore a youthful appearance.

Just watching the advertisement, you'd think the face cream was a fountain of youth.

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(mythology) Legendary spring of water with magical properties to restore youth and health to those who drink from it.
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