Re: How do you remind a child at heart forever?
There aren't any, really. You either have it or you don't. Anything that you attempt to do that does not originate within you will simply be a fabrication, a secondary motion, which would be devoid of meaning and authenticity.
Michael was able to "remain young forever" because he was always that way. He was different from the rest of the world without even realizing it--it wasn't a conscious effort on his part but rather part of his personality. He truly existed on a whole other level than the rest of humanity, a better level.
The ones who don't have it in them are able to grow up and live ordinary lives without resenting this fact because they don't understand the value of what they don't have.