The fictional Captain America was frozen and came back to life after about a few decades. Now in reality, roundworms from two areas of Siberia came back to life in Petri dishes after being frozen for 42,000 years. Neanderthals were just going extinct about the time these worms were frozen.
The first human aboriginal settlements had not been made yet for another 2000 to 12000 years. Some 300 prehistoric worms from permafrost were analyzed – and two ‘were shown to contain viable nematodes’.
After being defrosted, the nematodes showed signs of life and then they started moving and eating.
The old homo sapien bones from outside Africa and the Middle east were from 50,000 years ago in Siberia.
One worm came from an ancient squirrel burrow in a permafrost wall of the Duvanny Yar outcrop in the lower reaches of the Kolyma River. This is near where the Pleistocene Park is being made. They are trying to recreate the Arctic habitat of the extinct woolly mammoth. This squirrel burrow worm is around 32,000 years old.
Another was found in permafrost near Alazeya River in 2015, and is around 41,700 years old.
Currently the nematodes are the oldest living animals on the planet. They are both believed to be female.