User blog comment:I was a brain child/Birthdays!!!!!/@comment-3146930-20111029143427/@comment-4328795-20111111005136

i think annabeth is just a little younger than percy, because if she's older than him, that would put her in a different school grade than percy (as percy was kept back from starting kindergarten as the youngest in his class, so instead he's the oldest.) i believe the october 19th theory more than the older theory.