Hook goes to Neverland to not age again, because he needed a weapon to kill the Dark one for revenge. He knew already that he would not age there, that could mean that he was doing that before. So this is a hint that he could be Peter Pan, because he want to stop aging.
It would be no problem to give him a backstory a s Peter, when he was a child.
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Heros don't get their Happy Ending!