Sorry to reply U lately... Just came back from Long Vocation...
About the question of 'The Kidult' topic U ask at 28 Dec 2007:" In my opinion, everone got a ‘KID' SIDE in our heart. It also refer to Chinese Word '赤子之心'.
What do I mean about "the main cause depend on the thing U care much...", is that ever person got they most favourite thing which they put on the 'LIST OF MOST WANTED OF THEY LIVE' so when they face to they 'target', mostly they will act like a kid.
For example: a 'StarWars' fan, when they saw the toy of they favourite character for example Han Solo or Dark Vader the will buy it evan it cost expensive & evan the fan already adult & evan he will be angry by his wife... He just do it because he still got the 'Kid Side' inside his heart... (p/s: by the way, toys today is not just design for kid only)
Have a nice day!