Pudding is not human, she's a Three Eye.
Giants for example have a lifespan of hundreds of years. Maybe they mature at 50 yo, so you can't apply the same age standards as you would for humans.
Pudding is someone who has seduced countless men before Sanji, and was taking great pleasure in leading them all to their deaths. She's also incredibly manipulative, and a significant part of her character is faking innocence when she's exactly the opposite.
Pudding's character portrayal and level of maturity is well about the average One Piece character, and all the themes revolving around her character are incredibily mature as well.
To go out of your way to push "Pedophilia" as a topic because of fucking Puding is so pathetic i'm at a loss of words to even describe it's extent, and it absolutely goes to trivialize the whole thing just so you can get a kick out of shit talking a fiction character.