Until they were replaced by other religions, as Islam and Christianity.
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The Greek myths can not be bothered about time.
Gods are alive and immortal as long as people believe in them. Nobody has seen them - they exist in your faith. When Christianity took over Europe, the ancient gods (Norse, Gaelic, Greek, Roman) ceased to exist in people's minds. What remains are the stories - the Myths. You are allowed to believe in what you like: Avatars, Cinderella, Spiderman, Zeus...
The whole system of Greek myths were collected and put in writing in the 8th century BC. They were already very old, impossible to say how old.
I am an expert on Greek myths. Hades was banished to the Underworld by his brothers Zeus and Poseidon. He stayed there forever and is still there now if you believe in this stuff. Hades only got to come up from the Underworld during the winter solstice for an annual meeting of the Gods.
The greeks believe that the human race was created from clay, long ago by Prometheus.