The oldest water on Earth was discovered in a Canadian gold mine and it's thought to be 1.5 to 2.5 billion years old. Oh, and it's super salty. https://www.iflscience.com/a-geologist-found-the-oldest-water-on-earth-and-then-she-tasted-it-69365
The water had been there for over 2 billion years, and contained traces of life.
iflscience.com
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