I keep thinking every time I see a "they knew Percy was going to die at 16" post that actually, they didn't, and it's worse than that. Even if Percy accepts the prophecy as his before he knows exactly what it says, he knows it happens after he turns sixteen--and that's the key.
No one knew Percy was going to die at sixteen because no one knew if he'd make it to sixteen. What they knew was that if he made it to 16, he would die. But honestly (the way they were reading the prophecy) making it to sixteen was the best case scenario for Percy (other than the whole prophecy coming true part). The child of the prophecy is after all supposed to be making it to sixteen "against all odds," so it's unlikely he's actually going to make it at all.
It's not Annabeth befriended a boy she knew would die at sixteen. It's Annabeth befriended a boy who would probably die before he was sixteen. It's not Poseidon came to Percy's birthday because he'd die when he turned sixteen. It's Poseidon came to Percy's birthday because one way or another he wasn't going to make it another year, and he was fucking lucky to have made it so far.
I just feel like everyone says "Percy was going to die at 16 and everyone knew" but actually as soon as they saw him at twelve they knew he wasn't going to make it past 16 but probably that they'd lose him before that. Like I feel like Chiron was probably worried about Percy being a summer-only camper because of the way his power would attract monsters throughout the year, but also feel almost like it was a good idea because it gave him so many more opportunities to die before the prophecy could come true. Maybe that would be kinder, more humane. Like, unlike Harry Potter where the child of the prophecy is raised "like a pig for slaughter," Percy is raised with the expectation that he'll die before he's old enough for the prophecy to apply. They're hoping he's not the pig and they won't have to slaughter him. Idk











