User blog comment:Dezza/Is it me, or do people in One Piece turn out taller as they age?/@comment-2109035-20100610002631

I think that it's just the general height of different people, as Oda said. Remember, Gecko Moria is obviously some other form of human, as he has a long neck and horns, so a lot of people in one piece are just, you know, really tall.