Theseus is a legendary king, possibly based on a real person, but because of the fantastic nature of his birth (he had two fathers, one of whom was Poseidon), no date of birth is given. Without that, there is no way to know how old he was when he died. He would have been relatively young though, because his son Acamus was present at the Battle of Troy, but he was not, meaning he was already dead (as he was definitely one of Helen's suitors, he tried to kidnap her for himself when she was younger).
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He saw the black sail and thought that Theseus was dead. he through himself off a rocky height into the sea and died.
skyros killed him by pushing him off a cliff when he was no longer popular in athens. Edit: Theseus had fled to the island of Skyros after being declined by his own people because the Athenian's were being told that Theseus was keeping them locked up in the city and took their powers away during Theseus' absence by a noble named, Menestheus. Theseus died by being pushed off the cliff on the island of Skyros, by the King of Skyros, Lycomedes in fear that Theseus would dethrone him.
Theseis is the story of Theseus
Two women married Theseus. These were Hippolyta and Phaedra. Theseus did not have both as wives simultaneously.
For love of Theseus.