24,000 years old...
Researchers previously found that modern rotifers could be frozen at minus 4 degrees Fahrenheit (minus 20 degrees Celsius) and then revived up to 10 years later. Now, scientists have resuscitated rotifers that froze in ancient Siberian permafrost during the latter part of the Pleistocene epoch (2.6 million to about 11,700 years ago). Once thawed, these ancient rotifers began reproducing asexually through parthenogenesis, creating clones that were their genetic duplicates.
https://www.livescience.com/rotifer-...s-revived.html
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