The Greeks didn't date things the way we do. At no point in the Argonautica will you read, "... and Jason and the Argonauts came upon the Talos, which was 300 years old at the time...".
Since we are dealing with MYTH here, time and age do not factor.
The greek myths are as old as the greeks, for they are who made them.
The Greek myths have no relation to our chronology.
There is no chronology in the Greek myths.
In Greek mythology, Talos dies in the story of Jason and the Argonauts. Talos is a giant bronze automaton who is defeated by the Argonauts when Medea tricks him into removing a nail that keeps his life force intact, causing him to bleed out and die.
The Greek myths were the ancient Greek's religion.
The greeks created greek myths
The Greek Myths was created in 1955.
The giant metal man in Greek mythology is known as Talos. He was a bronze automaton created by Hephaestus to protect the island of Crete. Talos patrolled the shores of Crete and threw stones at ships to protect the island from invaders.
Artemis was both immortal and ageless in the Greek myths so no one can say.
Greek myths origiated from Greece in 800bce
They are thousands of years old and not made by any one person.
Largely because the Greek myths are at least three thousand years old: they are known world-wide, authors may wish to "cash into" that knowledge a reader has, or keep the Greek myths going strong.