How old is poseidon god of the sea?

after him, Hades, and Zeus threw their father (Kronos; lord of the titans) in tarterus, the 3 brothers agreed into it.

nothing else

In Greek mythology, Poseidon was the god of the sea. If he was real or not is up to your belief, however, it is generally accepted as pure myth.

there was a war between poseidon's father and his kids poseidon, zues and hades. when they won poseidon chose the sea, zues the sky and hades the underworld

poseidon had alot of kids with mortals and goddesses (even men sometimes) each child had some power over water but none is the god or goddess of the sea poseidon is a god and gods are unaging so...