I just thought of something that I mentioned in my post on the thread of 'Should Sora ever meet Melody.' I don't know if I was rude for correcting that one user with Wendy's daughter being named Jane. What do you think?
I think with the Kingdom Hearts obsession with time travel that Xehanort uses, we could likely see Melody and Sora wouldn't have to age. Sora going to the Pridelands could possibly age him into an adult lion.