Yeah, that doesn't show how Ansem SoD physically changed Riku's structure or age..
It actually shows nothing of the sort
Ansem SOD LITERALLY changed how old the body was. The body's actual height doubled. Everything about it transformed. Once he possessed the body, Ansem SOD was in Riku's body from that point forward, even in the End of the World.
Unless you think Ansem looks just like Riku, then you should be able to understand that Ansem completely changed the body's structure and age. The body went from resembling a young white boy to a fully grown dark-skinned and very muscular man.
All I'm saying is that there's a big difference in appearance, and Ansem SOD molded the body to fit his appearance, thus changing its age and structure.
lol..I thought is Riku grown up xD
We're talking KH1 when he was still a young boy.