Thought Experiment

My 3 year old informed me today he didn't want to grow up and would prefer to say "little" forever. Now say the world of science could meet such a request - let's call it an aging blocker. Not totally implausible, right? Would this be a good idea? I mean, it must be tough if you are a 3-year old trapped inside a 30-year old body? I mean, this isn't really fair, right? Likewise, it must also be tough if you are what people call an "old soul" while in middle school and high school. Lots of movies have told us this. What is one to do? Should we be fixing this problem? Writing some legislation? Changing laws? Why not?